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Fix Server not Found for some websites in Firefox Browser

firefox browser server not found
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Firefox is one of the most popular browsers after Chrome and IE. In the past, Firefox was the most popular browser. But in recent times, the popularity declined owing to discovery of bugs, slow performance of browser and increased RAM usage.

Server not found is one of the common errors on Firefox. The reason can be attributed to slow internet connection, presence of too much temp files, DNS problems etc. Try troubleshooting in this order to fix server not found for some website in Firefox browser.

  1. Close all open Firefox windows and start over

The error may happen soon after Firefox installed some updates for itself in the background. This can lead to build up of temporary files and conflicts between Firefox files. So you need to shutdown Firefox completely and start over.Some instances of Firefox may still run in the background even if you close it. To prevent that, open Task Manager by pressing Ctrl+ Shift + Esc, check if there are any Firefox entry inside. If Yes, right click and select end process to close the service completely.

Open Firefox and check if server not found error is coming back.

  1. Remove temp files from Firefox

The Firefox browser might be carrying lot of temporary files which might be a problem.Open Firefox browser. Click Tools , click Options, go to Advanced Tab. Under Cached Web Content. Click on Clear Now for web content cache.
Another popular and most effective method is using tools like Ccleaner. Cccleaner is very effective in removing temp files including system and browser related files. Here is a detailed information on How to use Ccleaner.

Check if there are any more error messages.

  1. Restart computer and modem

Restarting computer and modem is recommended, so that everything is reset. Lot of problems related to browsers and OS can be fixed by a simple restart. Also, turn of the modem and router for 2-3mts. (Turning it off for 2-3mts help in proper power cycling) Now turn it on.Now check the status of the problem.

  1. Confirm Firewall is not a problem

Changes in Firewall settings may lead to accidental block by Firewall. Open Firewall and select load default settings. This should remove if there is any accidental blocking of certain website or block of certain Firefox settings by Firewall. Now check if the problem is solved.

  1. Change DNS address
  • Press Windows Key + R. Type ncpa.cpl for opening Network Connections window
  • right click on local area connection, then click properties
  • Click Internet protocol version(TCP/IPv4), then properties
  • Click internet protocol ,select use the following DNS server address
  • change DNS server address to global DNS value given below
    Alternate (You can also use Google’s DNS address preferred and alternate

Now check the status.

Hopefully, this should help you in fixing server not found for some websites in Firefox browser. Use comment section for any queries and feedback.

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About the author: Anup Raman A Tech Enthusiast|Blogger|Tech Trainer with 10+ yrs experience in the field of IT. My expertise are in Operating Systems, mainly Windows and Computer security which comes from my experience, working as Tech Support and Trainer for Microsoft, Symantec and McAfee. Loves blogging about Technical Troubleshooting, discussing latest Gadgets, Games and doing Reviews.

{ 3 comments… add one }
  • Col May 25, 2017, 2:19 am

    Thanks, Anup, after weeks of trying other suggestions, it was yours that worked.

  • Steve Mar 26, 2017, 5:02 am

    Your advice on “server not found” fix worked! I am keeping my old DEll 400 XP going but to do so had to use Firefox as Google Chrome and Windows no longer support.
    I found so many entries about this firefox issue but all advice but yours did not work.
    Thank you!!
    Steve S

  • poochyena Oct 21, 2016, 5:13 pm

    This worked, omg thank you.

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