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Have you ever tried to access a site on your Android phone, but got a DNS server error instead? And did you think it was because of the website’s server problem? Or weak signals from your Wi-Fi?
Well, you are not alone. Many Android users give up in trying to access the website when they stumble upon an error. They either think the site is down, or the Wi-Fi has bad signals and try later — only to get the same error.
Today, we will discuss how to discover and solve DNS server problems in Android.What is a DNS Server?
When you are trying to access a website on the Internet, your first step would be to type the address in the URL bar. Do you think our Android system, or your PC for that matter, knows exactly what to do when you type chúng tôi Well, it does, but with the help of a DNS server.
The Domain Name System (DNS) is basically like a phonebook of the Internet. It stores all the addresses or domain names with respect to their actual IP addresses. So, when you type chúng tôi the DNS server will map the domain to its corresponding IP address and will show you the website information.
Various other servers come into play to access the webpages. However, the DNS server makes it happen by handling all the DNS queries.DNS problems in the older versions of Android
Most DNS server problems go unnoticed in Android because let’s be honest — we don’t really pay much attention when a website doesn’t open up. We simply think it’s an issue with the Wi-Fi and leave it at that.
However, in most cases, your DNS server might be the culprit. It does get challenging to pinpoint the cause, especially in mobile platforms like Android. Internet problems like no connectivity, unable to open websites, connection timed out error messages occur due to DNS server slowdown and other issues.
Since there isn’t a proper notifying mechanism about DNS server errors in the older versions of Android, these problems mask themselves as Wi-Fi problems. Maybe you wanted to play cool online RPG games, but now you can’t because your connection doesn’t seem to be working.
To discover DNS problems on Android, first, check whether the Internet is working or not. If it’s not working, you might have to call your ISP. If the Internet is working and you can’t access certain websites, it could be a DNS server error. The giveaway is when these websites don’t open on your device but are working properly on other devices.How to fix DNS issues on Android
Now that you know how to identify a DNS server, it’s time to learn how to fix it too. Here’s how you can fix DNS server errors in Android.Enable/Disable the Internet
Sometimes, the easiest fix is to refresh the router. If you are connected to Wi-Fi, turn the router off, wait 10 seconds, and restart. Further, if you are using a mobile internet connection, try disconnecting and then reconnecting.
If this step doesn’t fix the issue, move on to the next step.Change your DNS server
There are lots of options for public DNS servers, and switching to these servers normally fixes the issue. So, how do you do it?
The settings differ upon various phone models. Here, I changed the DNS server on Android Pie (Android version 9) on Samsung Galaxy A50.
Here are the steps:
Open Wi-Fi settings on your Android device
Tap once on your network, and go to Advanced settings
Change IP settings to Static
Write the DNS server IPs to DNS 1 and DNS 2 (For Google’s free DNS, DNS 1 is 184.108.40.206, DNS 2 is 220.127.116.11)
Tap on save
Disconnect from the network and connect again
Now try opening the websites that didn’t work before. This should fix the issue. Moreover, using Google’s or Cloudfare DNS servers will boost your internet speed as well.
Some free DNS servers:
Alternate DNS: 18.104.22.168
Alternate DNS: 22.214.171.124
Alternate DNS: 126.96.36.199
Alternate DNS: 1.0Restart your Android device
When you restart a computerized device, it gets refreshed. So, sometimes when a DNS server error pops up and the steps mentioned above don’t work, this should do the job.Update Google Play Services
Many apps require Google Play Services to run. Sometimes, an error of “dns_probe_finished_no_internet” pops up when your Play Services aren’t up-to-date. So, updating Google Play Services will likely solve the DNS server issue.Android 11 will show DNS server problems on Wi-Fi
Lately, Android 11 has been making news about all its cool new features. And rightfully so, as Android users will finally be getting a screen recorder, scrolling screenshots, and many more. But the most useful feature, in our opinion, is going to be showing a detailed explanation when a network doesn’t work. This is especially applicable in cases of DNS server errors.
The older versions of Android simply showed “can’t connect” or “no internet” error. Or, you had to check the private DNS setting in order to find out what went wrong.
However, in Android 11, this information will be displayed right under the Wi-Fi network, making it easier to troubleshoot connectivity problems. This version will reportedly also send a notification with DNS server error in case you didn’t open the Wi-Fi settings page.
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How to Change Your DNS Server on Android Benefits of Using Third-Party DNS
Although most users use their ISP’s default DNS servers, third-party solutions produce superior results. They are as follows:
You can enjoy faster speed with third-party DNS servers.
Protect yourself from ISP tracking and data sharing without your knowledge.
No-log DNS helps maintain online privacy.
Bypass geographical locks
Last, DNS providers like OpenDNS can protect against cyber attacks and malicious sites.
Apply parental controls and site filtering.Popular DNS Services
Google Public DNS is the most popular DNS service. It supports DNS over TLS (DoT) and DNS over HTTPS (DoH), so requests are delivered over a secure channel. However, if you don’t trust Google CloudFlare 188.8.131.52 is another popular choice. According to most independent testing, it is the quickest DNS service accessible.How to Change DNS on Android?
Note: The exact menu options might vary from one manufacturer to another before you plan to use if the selected DNS service provider supports DNS-over-TLS before setting.
Furthermore, when you use a VPN, which overrides private DNS settings, these changes have no impact.
Navigate to your device’s Wi-Fi settings. You may do this by navigating to Settings and selecting Wi-Fi or pulling down the notification shade & long-pressing the Wi-Fi symbol.
Now, navigate to your Wi-Fi network’s network settings. Depending on your phone’s brand and Android version, you need to long-press the Wi-Fi network’s name and then hit Modify Network, or there may be an arrow on the side.
Scroll to the bottom of the network information page and touch on IP Settings. If you don’t see that menu, check for an Advanced option and IP Settings.
Change this to a static value.
Change DNS1 and DNS2 to the desired values- for example, Google DNS is 184.108.40.206 and 220.127.116.11.AC.On Android 8 Or Earlier, Follow These Steps:
Android Oreo and earlier versions do not permit modifying DNS servers for cellular networks. This means you can apply the following DNS settings only on Wi-Fi connections. Even so, the modifications are network-specific, and you’ll need to update the DNS servers whenever you join a new wireless network.
Furthermore, you’ll have to set up all network information manually; thus, these changes are only suggested for sophisticated users.
To modify a Wi-Fi network, follow these steps:
Look for the Wi-Fi network you are connected to.
Tap the Gear icon to get a list of options.
Hit View More
Tap IP Settings.
This will read ‘DHCP,’ Tap on it and change it to “Static.”
Tap on it and change it to ‘Static.’
Now, manually enter your network settings, including your DNS server. An example would be 18.104.22.168 & 22.214.171.124.
Wrap Up – Change Your DNS Server on Any Android Device.
So there you have it. Following the steps mentioned above, you can modify the DNS setting on any Android device. The steps might vary a bit due to the brand or Android version. They will work for all. We hope you will be able to change the DNS, IPv4, and IPv6.Quick Reaction:
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Internet connection problems? DNS cache corrupted? Facing DNS issues or problems? Maybe you need to flush Windows DNS Cache. If your computer finds it difficult to reach a certain website or server, the problem may be due to a corrupt local DNS cache. Sometimes bad results are cached, maybe due to DNS Cache Poisoning and Spoofing, and therefore need to be cleared from the cache to allow your Windows computer to communicate with the host correctly.
Typically, there are three types of caches in Windows that you can flush easily:
Clearing the Memory Cache can free up some system memory while clearing the Thumbnail Cache can free up space in your hard disk. Clearing the DNS Cache can fix your internet connection problem. Here’s how you can flush the DNS cache in Windows 11, Windows 10, Windows 8 or Windows 7.Flush DNS Cache in Windows 11/10
To flush the DNS Cache in Windows 11/10 you need to:
Open an administrative command prompt window as an administrator
Type ipconfig /flushdns and hit Enter
You should see – Windows IP Configuration. Successfully flushed the DNS Resolver Cache
Your DNS cache should have been reset.
Let us see it in a bit more detail.
Next, type the following and hit enter:
You should be able to see a confirmation dialog window:
Windows IP Configuration. Successfully flushed the DNS Resolver Cache.
Once the requisite process is complete and existing cache data has been flushed, you may execute the command mentioned below:ipconfig /registerdns
This step is to register any DNS records that you or some programs may have recorded in your Hosts file.How to flush DNS Cache using PowerShell
To flush DNS Cache using PowerShell, run PowerShell as administrator and execute the following command:Clear-DnsClientCache
Read: How to clear or flush Google Chrome DNS CacheHow to refresh DNS cache every few hours automatically?
Take a backup of your registry before making any changes.
Open Run prompt, type regedit, and press the Enter key
This will open Registry Editor
Set the Name as MaxCacheTtl and set the value in seconds. The default is 86400 seconds which is one day.
Repeat the same and create another DWORD with the name MaxNegativeCacheTtl and value as 5
This will make sure the local DNS cache is refreshed every few hours.How to display DNS Cache
If you wish to confirm if the DNS cache has been cleared, you can type the following command and hit Enter:ipconfig /displaydns
This will display the DNS cache entries if any.How to Turn Off or Turn On DNS Cache
To turn off DNS caching for a particular session, type net stop dnscache and hit Enter.
To turn on DNS caching, type net start dnscache and hit Enter.
Of course, when you restart the computer, the DNC caching will, in any case, be turned on.
NOTE: Here’s a Batch File to Release TCP/IP, Flush DNS, Reset Winsock, Reset Proxy all at once.How to Disable DNS Cache
If for some reason you wish to disable DNS caching, type services in start search and hit Enter to open the Services Manager. Here locate the DNS Client service.
The DNS Client service (dnscache) caches Domain Name System (DNS) names and registers the full computer name for this computer. If the service is stopped, DNS names will continue to be resolved. However, the results of DNS name queries will not be cached and the computer’s name will not be registered. If the service is disabled, any services that explicitly depend on it will fail to start.
These resources may also interest you:
Introduction to PowerShell Uptime
Uptime is a metric that denotes and it measures the successful operational duration of a computer network or hardware. IT industry terms the duration of the operational system as uptime. In PowerShell, the cmdlet gives the elapsed time of the recent boot of the operating system and this function is introduced in PowerShell 6.0. To fetch the uptime on Linux, Windows, and macOS, the user can go for Get – uptime cmdlet in PowerShell. The –since the command is used to fetch the recent time and date of the operating system is booted.
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Hadoop, Data Science, Statistics & othersWhat is PowerShell Uptime?
PowerShell is used for configuration management and task automation using a command line function or scripting. PowerShell is executed on macOS, Linux, and Windows. Uptime command executes the information about how the system is running together successfully with the current time, number of running sessions, number of users and sessions, system average load for the past one minute, five minutes, and fifteen minutes.How to Use PowerShell Uptime?
Hardware components like cables and switch keyboards are connected to form a server. It is off-site and works as intermediate transit and thus forms the crucial part of the operation. So the company’s infrastructure team consists of dedicated weekly or daily tasks to monitor the performance of the system via different metrics. Uptime is one of the mandatory metrics to measure the system performance, and it measures the amount of time that the system is ON without any shutdown or restart. The user doesn’t want the system to fail in the middle of the tough load and so he checks the uptime of the system. An Infrastructure team can fix the system and application health and manage it to prevent unexpected downtime. The diagnosis should be minimal so the user can fix the issue easily to ensure the company’s efficient working as time is money, and the business doesn’t want to face any unexpected shortage.
To ensure this Microsoft PowerShell is launched, keep an eye on uptime. A high uptime rate increases the system’s availability and reliability, whereas downtime is disturbing in terms of reputation and cost.How to Check Server PowerShell Uptime?
Capacity management should be planned, and there should be considerable resources to manage the needs of the company. Based on the uptime, there should be a periodic check on machines whether it needs a restart or replacement. Hence uptime is a tedious measure in the business.
The user has to understand the terms of the common information model and windows management instrumentation. WMI is composed of multiple extensions and offers details about the operating system. Whereas the common information model provides management details like properties of the device and application. It also includes the business tools that enable IT to know about the infra and they can find it without any delay. The admin can access the common information model like uptime and other properties via WMI.PowerShell Uptime Server 4 Ways
The PowerShell uptime can be found and fixed in four ways, and they are given below:1. Windows Management Instrumentation Querying
The user can find the uptime of the windows server by WMI queries. The extension of WMI is used to calculate uptime in a class known as Wi32_operating system, and it is built with multiple properties. The Lastbootuptime command explains when the system has been rebooted recently. It also requires the CIM data, and it should be fixed.
The output will be in the date and time format that is used to compute the uptime.2. Windows Event Log
The admin can access this data in PowerShell via Get –win event command or get –eventlog command. It gives the details of event tracing logs and event logs placed on remote and local computers. Rather than viewing all the complete log files, the user can search the metrics and view them using individual ids. The code in PowerShell is used to get the last restart date and time.
The important parameters in Get-winevent are:
computername: Gives the name of the computer where the system log is stored.
Credential: User account which has the permission to perform this action.
Filterhashtable: Takes the queries in hashtable format.
filterXML: Gives the structured XML query.
force: Gives the debug log if the name of the computer has wildcard characters.3. Using the Get-uptime Command
The admin can use Get-uptime to fetch elapsed time of the last reboot.Get –uptime and [-since]
Output:4. Custom Scripts
The user can develop their scripts in groups develop. The command below gives the script executed by a computer and parses the event log in the computer to find the last restart time. Then it computes the total time the server is running. It also gives the history of the computer’s start and stops time.
Code:-/ get –serveruptimereport .ps1 –the name of the computer comp 1
Hence PowerShell helps the business to give uninterrupted services to the users. Classifying the cause of downtime can help in capacity planning, budgeting, better infrastructure management, and decision making.Recommended Articles
This is a guide to PowerShell Uptime. Here we discuss the introduction, and how to check server PowerShell uptime? And server 4 ways. You can also go through our other related articles to learn more –
Customers usually turn to the internet to get information and buy products and services. Towards that end, most organizations have websites. Most websites store valuable information such as credit card numbers, email address and passwords, etc. This has made them targets to attackers. Defaced websites can also be used to communicate religious or political ideologies etc.
In this tutorial, we will introduce you toweb servers hacking techniques and how you can protect servers from such attacks.How to Hack a Web Server
In this practical scenario, we are going to look at the anatomy of a web server attack. We will assume we are targeting chúng tôi We are not actually going to hack into it as this is illegal. We will only use the domain for educational purposes.Step 1) What we will need
Bing search engine
SQL Injection Tools
Stept 2) Information gathering
We will need to get the IP address of our target and find other websites that share the same IP address.
We will use an online tool to find the target’s IP address and other websites sharing the IP address
Enter chúng tôi as the target
You will get the following results
Based on the above results, the IP address of the target is 126.96.36.199
We also found out that there are 403 domains on the same web server.
Our next step is to scan the other websites for SQL injection vulnerabilities. Note: if we can find a SQL vulnerable on the target, then we would directly exploit it without considering other websites.
Enter the URL chúng tôi into your web browser. This will only work with Bing so don’t use other search engines such as google or yahoo
Enter the following search query
“ip:188.8.131.52” limits the search to all the websites hosted on the web server with IP address 184.108.40.206
“.php?id=” search for URL GET variables used a parameters for SQL statements.
You will get the following results
As you can see from the above results, all the websites using GET variables as parameters for SQL injection have been listed.
The next logic step would be to scan the listed websites for SQL Injection vulnerabilities. You can do this using manual SQL injection or use tools listed in this article on SQL Injection.Step 3) Uploading the PHP Shell
Open the URL where you uploaded the chúng tôi file.
You will get the following window
Once you have access to the files, you can get login credentials to the database and do whatever you want such as defacement, downloading data such as emails, etc.Web server vulnerabilities
Default settings– These settings such as default user id and passwords can be easily guessed by the attackers. Default settings might also allow performing certain tasks such as running commands on the server which can be exploited.
Misconfiguration of operating systems and networks – certain configuration such as allowing users to execute commands on the server can be dangerous if the user does not have a good password.
Bugs in the operating system and web servers– discovered bugs in the operating system or web server software can also be exploited to gain unauthorized access to the system.
In additional to the above-mentioned web server vulnerabilities, the following can also led to unauthorized access
Lack of security policy and procedures– lack of a security policy and procedures such as updating antivirus software, patching the operating system and web server software can create security loop holes for attackers.Types of Web Servers
The following is a list of the common web servers
Apache– This is the commonly used web server on the internet. It is cross platform but is it’s usually installed on Linux. Most PHP websites are hosted on Apache servers.
Internet Information Services (IIS)– It is developed by Microsoft. It runs on Windows and is the second most used web server on the internet. Most asp and aspx websites are hosted on IIS servers.
Apache Tomcat – Most Java server pages (JSP) websites are hosted on this type of web server.
Other web servers – These include Novell’s Web Server and IBM’s Lotus Domino servers.Types of Attacks against Web Servers
Directory traversal attacks– This type of attacks exploits bugs in the web server to gain unauthorized access to files and folders that are not in the public domain. Once the attacker has gained access, they can download sensitive information, execute commands on the server or install malicious software.
Denial of Service Attacks– With this type of attack, the web server may crash or become unavailable to the legitimate users.
Domain Name System Hijacking – With this type of attacker, the DNS setting are changed to point to the attacker’s web server. All traffic that was supposed to be sent to the web server is redirected to the wrong one.
Sniffing– Unencrypted data sent over the network may be intercepted and used to gain unauthorized access to the web server.
Phishing– With this type of attack, the attack impersonates the websites and directs traffic to the fake website. Unsuspecting users may be tricked into submitting sensitive data such as login details, credit card numbers, etc.
Pharming– With this type of attack, the attacker compromises the Domain Name System (DNS) servers or on the user computer so that traffic is directed to a malicious site.
Defacement– With this type of attack, the attacker replaces the organization’s website with a different page that contains the hacker’s name, images and may include background music and messages.Effects of successful attacks
An organization’s reputation can be ruined if the attacker edits the website content and includes malicious information or links to a porn website
The web server can be used to install malicious software on users who visit the compromised website. The malicious software downloaded onto the visitor’s computer can be a virus, Trojan or Botnet Software, etc.
Compromised user data may be used for fraudulent activities which may lead to business loss or lawsuits from the users who entrusted their details with the organizationWeb server attack tools
Some of the common web server attack tools include;
Metasploit– this is an open source tool for developing, testing and using exploit code. It can be used to discover vulnerabilities in web servers and write exploits that can be used to compromise the server.
MPack– this is a web exploitation tool. It was written in PHP and is backed by MySQL as the database engine. Once a web server has been compromised using MPack, all traffic to it is redirected to malicious download websites.
Zeus– this tool can be used to turn a compromised computer into a bot or zombie. A bot is a compromised computer which is used to perform internet-based attacks. A botnet is a collection of compromised computers. The botnet can then be used in a denial of service attack or sending spam mails.
Neosplit – this tool can be used to install programs, delete programs, replicating it, etc.How to avoid attacks on Web server
An organization can adopt the following policy to protect itself against web server attacks.
Patch management– this involves installing patches to help secure the server. A patch is an update that fixes a bug in the software. The patches can be applied to the operating system and the web server system.
Secure installation and configuration of the operating system
Secure installation and configuration of the web server software
Vulnerability scanning system– these include tools such as Snort, NMap, Scanner Access Now Easy (SANE)
Firewalls can be used to stop simple DoS attacks by blocking all traffic coming the identify source IP addresses of the attacker.
Antivirus software can be used to remove malicious software on the server
Disabling Remote Administration
Default accounts and unused accounts must be removed from the system
Default ports & settings (like FTP at port 21) should be changed to custom port & settings (FTP port at 5069)Summary
Web server stored valuable information and are accessible to the public domain. This makes them targets for attackers.
The commonly used web servers include Apache and Internet Information Service IIS
Popular web server hacking tools include Neosploit, MPack, and ZeuS.
A good security policy can reduce the chances of been attacked
Earlier, I had written a post on how to turn your computer into a Windows file sharing server using a couple of different programs. If you’re looking for a quick way to share the files on your local computer with friends or family, this is an easy way to do so.
However, if you’re looking to setup your own FTP server in Windows using IIS, you can do so, but it requires more technical knowledge. Of course, it also gives your more granular control over sharing and security, so it’s better for anyone who has a little computer know-how. Plus, IIS is all about running websites, so if you want to run a couple of websites along with an FTP server, then IIS is the best choice.
Table of Contents
It’s also worth noting that different versions of IIS come with each flavor of Windows and they all have slightly different feature sets. IIS 5.0 came with Windows 2000 and 5.1 came with Windows XP Professional. IIS 6 was for Windows Server 2003 and Windows XP Professional 64-bit. IIS 7 was a complete rewrite of IIS and was included with Windows Server 2008 and Windows Vista.
IIS 7.5 was released along with Windows 7, IIS 8 released with Windows 8 and IIS 8.5 released with Windows 8.1. It’s best to use IIS 7.5 or higher if possible as they support the most features and have better performance.Setup and Configure an FTP Server in IIS
The first thing you’ll need to setup your own FTP server in Windows is to make sure you have Internet Information Services (IIS) installed. Remember, IIS only comes with Pro, Professional, Ultimate or Enterprise versions of Windows.
Setup and configure IIS for FTP
For Windows 7 and higher, you’ll see a different look to IIS. Firstly, there is no play button or anything like that. Also, you’ll see a bunch of configuration options right on the home screen for authentication, SSL settings, directory browsing, etc.
This opens the FTP wizard where you start by giving your FTP site a name and choosing the physical location for the files.
Next, you have to configure the bindings and SSL. Bindings are basically what IP addresses you want the FTP site to use. You can leave it at All Unassigned if you don’t plan on running any other website. Keep the Start FTP site automatically box checked and choose No SSL unless you understand certificates.
Lastly, you have to setup authentication and authorization. You have to choose whether you want Anonymous or Basic authentication or both. For authorization, you choose from All Users, Anonymous users or specific users.
You can actually access the FTP server locally by opening Explorer and typing in ftp://localhost. If all worked well, you should see the folder load with no errors.
If you have an FTP program, you can do the same thing. Open the FTP client software and type in localhost as the host name and choose Anonymous for the login. Connect and you should now see the folder.
Ok, so now we got the site up and running! Now where do you drop the data you want to share? In IIS, the default FTP site is actually located in C:Inetpubftproot. You can dump data in there, but what if you already have data located somewhere else and don’t want to move it to inetpub?
In Windows 7 and higher, you can pick any location you want via the wizard, but it’s still only one folder. If you want to add more folders to the FTP site, you have to add virtual directories. For now, just open the ftproot directory and dump some files into it.
Now refresh your FTP client and you should now see your files listed! So you now have an up and running FTP server on your local computer. So how would you connect from another computer on the local network?
In your FTP client on the other computer, type in the IP Address you just wrote down and connect anonymously. You should now be able to see all of your files just like you did on the FTP client that was on the local computer. Again, you can also go to Explorer and just type in FTP:\ipaddress to connect.
Now that the FTP site is working, you can add as many folders as you like for FTP purposes. In this way, when a user connects, they specify a path that will connect to one specific folder.
When you create a virtual directory in IIS, you’re basically going to create an alias that points to a folder on the local hard drive. So in the wizard, the first thing you’ll be asked is for a alias name. Make is something simple and useful like “WordDocs” or “FreeMovies”, etc.
You can connect to you using your FTP client by putting in the Path field “/Test” or “/NameOfFolder”. In Explorer, you would just type in ftp://ipaddress/aliasname.
Now you’ll only see the files that are in the folder that we created the alias for.
Finally, you’ll need to forward the FTP port on your router to your local computer that is hosting the FTP server. Port Forward is a great site to show you how to forward ports on your router to computers on your home network. You should also read my other posts on port forwarding and dynamic DNS:
What is Port Forwarding?
Setup Dynamic DNS for Remote Access
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