Fix Server not found, Firefox can’t find the server

A common problem is the “Server not found – Firefox cannot find the server“Error on Firefox. Many users have reported that they encounter this error when trying to load a website on Firefox, even if the website opens correctly with other browsers. If you are having the same problem, read this article for resolution.

Server error not found on Firefox

The most common causes are:

1. If the problem is specific to Firefox, it could be caused by malware or a virus.
2. An antivirus or a hyper-protective firewall can cause the error.
3. Domain name Server inconsistency.
4. Disabled instance of DNS client service.
5. VPN or proxy interference.

If you experience the same problem with other browsers, you will need to restart the modem router computer. If the Server not found error is Firefox specific, try opening other websites to further isolate the problem.

1. Temporarily disable the firewall and antivirus programs on your system
2. Use appropriate antivirus and anti-malware software to clean the system
3. Remove all proxy settings for Firefox
4. Disable DNS prefetch
5. Disable IPv6 in Firefox
6. Delete cookies and cache files

Let’s solve it server not found error on Firefox when trying the following solutions sequentially:

1]Temporarily disable the firewall and antivirus programs on your system

Windows Defender firewall and antivirus programs on your system can blacklist genuine websites, and this is a common problem. To isolate this cause, try temporarily disabling the Windows Defender firewall and antivirus program on your system. If that helps, whitelist Firefox for the antivirus program or the firewall.

2]Use appropriate antivirus and anti-malware software to clean the system

Many viruses are known to block certain websites. If the Server Not Found error is specific to Firefox, try cleaning the system from viruses and malware before attempting anything else. You can use Malwarebytes to remove malware.

3]Remove all proxy settings for Firefox

Proxy settings on Firefox may limit access to certain websites. The procedure for removing the proxy settings is as follows:

Open the address about: preferences on the Firefox address bar.

Scroll to Network settings in the General sign.

Position the radio button on No proxy and hit Okay.

4]Disable DNS prefetch

DNS prefetching helps speed up the loading of websites. However, it is known to cause problems when loading websites on browsers. The procedure for disabling DNS prefetching is as follows:

Open about: config on the Firefox address bar.

To select Accept the risk and continue.

Search network.dns.disablePrefetch in the search bar.

Change the preference value to the value of false at true using the toggle button.

5]Disable IPv6 in Firefox

IPv6 is enabled for Firefox by default. However, this is known to cause network issues when trying to access websites on the browser. To disable IPv6 for Firefox, do the following:

Open about: config on the Firefox address bar as in Solution 4.

To select Accept the risk and continue.

Search network.dns.disableIPv6 in the search bar.

Use the toggle button to change the preference value of false at true.

6]Delete cookies and cache files

Cache files store information about offline web page sessions and help load the web page faster when you open it again. However, if the cache files are corrupted, they will prevent the associated web page from opening properly. The resolution of this problem to delete cookies and the cache file, the procedure of which is as follows:

Click on Library on Firefox and select History> Clear recent history.

Change the time range for everything and check the boxes associated with biscuits and Hidden.

Hit Clear now to clear cookies and cache files for Firefox.

I hope it helps!