How to fix DNS Server Unavailable error


When your browser cannot establish a connection to the Internet, the Windows Troubleshooting function will respond with a DNS server not responding message or DNS Server Unavailable message. There are many factors that make that error message appear. Fortunately, there are many ways to fix this problem. The following article will guide you step by step how to fix DNS Server Unavailable error.


Domain Name System (DNS or domain name resolution system) is where all the domain names of the website you have visited are stored. When searching for a domain name in a web browser, it is forwarded to one DNS server by your router. If the domain name of a particular website has been saved, then it will return the corresponding IP address. This makes the loading process of those websites particularly faster.

However, sometimes the server cannot establish a connection. Trying to fix your web browser problem in this case may result DNS server error not responding. There are many reasons that notification appears on your computer screen. The most prominent among them is the possibility that the server is currently experiencing downtime and users can fix this problem with some solutions as follows:

Instructions for fixing DNS Server Unavailable errors

This problem can sometimes be solved by some very simple methods, such as switching to a different web browser, tweaking firewall settings or restarting the router.

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Start by using another web browser to open the site you are trying to access. This means that if you are currently receiving this error message while using Mozilla Firefox, then switch to Microsoft Edge or Google Chrome. If the problem persists, we can move on to testing other devices.

Open a web site using your mobile phone on the same network to ensure that the problem is not the result of a hardware fault, and do not forget to try to access the site with your data plan to Determine whether the actual cause is caused by DNS server or not. Finally, reboot your router. In case the DNS server unavailable error has not been fixed after trying some basic methods as above, it is time to apply more “advanced” methods.

1. Delete your DNS:

The most effective method to troubleshoot DNS server unavailable issues is to delete it using the Command Prompt.

1.1. On Windows

– Press the key combination Windows + R to open the dialog box Run.

– Import cmd and press Enter.

– In the window Command Prompt, you enter ipconfig / flushdns and press Enter.

– Continue by typing typing ipconfig / release and press Enter.

– Finally, enter ipconfig / renew and press Enter.

– Close the window Command Prompt and reboot the system.

1.2. On MacOS

Depending on the version of MacOS you are using, the process for removing DNS is a bit different. It usually only involves a change in the syntax used during the process.

Step 1: Open the window Finder and go to Applications> Utilities> Terminal.

Step 2: Enter the following syntax regarding the version of MacOS you are using:

– MacOS High Sierra – sudo killall -HUP mDNSResponder; sleep 2; echo macOS DNS Cache Reset | drunk

– MacOS Sierra – sudo killall -HUP mDNSResponder; say DNS cache has been flushed

– MacOS Mojave – sudo killall -HUP mDNSResponder; sleep 2;

– MacOS X El Capitan / Yosemite – sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder; say cache flushed

Step 3: Press the back key, enter the password and press the back key again.

– Wait for the sound alert to indicate that the DNS removal was successful before leaving the Terminal.

You will need to take a few more steps to clear the cache on MacOS X including clearing both the MDNS and UDNS cache above the steps that were previously taken. Before closing the Terminal window, enter the following commands:

– With the MDNS cache, enter it sudo discoveryutil mdnsflushcache

– With UDNS cache, enter sudo discoveryutil udnsflushcaches

2. Uninstall antivirus software:

Installing too many antivirus software at the same time on the computer may create a barrier to the provided protection. Check if you are installing more than 2 antivirus programs as this may cause DNS error. After disabling all unnecessary protection tools, restart your computer and it is possible that the DNS issue has been resolved.

You should only use a single anti-virus program to help protect yourself against malware attacks. Not only will this increase protection, but it can also help you avoid future DNS server errors.

3. Change the DNS server

If you tried to apply the above methods but it didn’t work, then maybe you should change the DNS server. There are plenty of public DNS to choose from, Google’s free DNS is one of the most trusted options. Process change DNS The server is very easy, with just a few simple mouse clicks.

3.1. Change DNS via router

Step 1: Access your router by opening a web browser and entering the address Default Gateway in the URL bar.

You can find this address by opening a window Command Prompt, import ipconfig and press Enter. Copy the number sequence next to the item Default Gateway.

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Step 2: Log into the router with the appropriate credentials.

Step 3: Locate your Internet account information that can usually be found in a tab with the corresponding name.

Step 4: Go to the DNS server and select the option that reflects the Internet protocol used (IPv4 or IPv6).

Step 5: Enter the address of the DNS server you want to use to replace the current DNS server.

Google’s DNS server will be 8.8.8.8 in DNSv4 and 8.8.4.4 in the DNS server instead. In the case of IPv6, you will enter times turn 2001: 4860: 4860 :: 8888 and 2001: 4860: 4860 :: 8844.

Step 6: Save the modified information and exit the router interface.

3.2. Change DNS via Windows OS

Step 1: Access your network connection properties by opening a dialog box Run (Windows + R) and enter ncpa.cpl. Then press Enter.

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Windows 10 users can right-click on the Windows icon and select Network Connections from the menu.

Step 2: Select the current network adapter in use. WLAN connections for Wifi and LAN for direct connection are usually via Ethernet cables.

You will have options on the left panel on Windows 10. Select and click Change adapter options from the main window.

Step 3: Right click on your selection and click Properties.

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Step 4: In the tab Networking, highlight your IP version (v4 or v6) from the menu and click the button Properties.

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Step 5: Choose Use the following DNS server addresses.

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Step 6: Enter the DNS server address you plan to use. If you have used previous DNS servers that were not automatically retrieved, be sure to save the addresses for in case you want to return to using them one day.

Step 7: Click OK, got it to apply changes.

3.3. Check the new DNS server

After the DNS servers have been changed, open a web browser and try to access a website. If the site immediately displays, then the new DNS is working properly. If not, enter one of the Google IP addresses like 172.217.16.195 directly into your browser and press Enter.

https://thuthuat.taimienphi.vn/cach-sua-loi-dns-server-unavailable-54479n.aspx
Wait until the familiar Google logo and search bar appear. If this method also fails, the problem may be with the Internet and not the DNS server. In that case, contact your Internet service provider for assistance.

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