5 ways to fix Firefox 3 Connection errors in Vista

I recently ran into some trouble after upgrading from Firefox 2 to Firefox 3 on Windows Vista on my laptop.

The Problem

As soon as I installed Firefox 3, I found that I frequently got “Connection Interrupted” or “Page Load” errors such as these, with no apparent explanation:

Connection Interrupted
The connection to the server was reset while the page was loading.
The network link was interrupted while negotiating a connection. Please try again.

Some possible solutions

A quick google revealed that many others were suffering the same problem.  Various solutions were suggested, which worked for some people, but not others.  In the end, I managed to resolve the problem by uninstalling Adobe Flash 9 and installing their new Flash 10 beta, which fixed this issue for me (see solution 3 below).

However, it seems that there are other potential ways of fixing the error and so I thought it would be handy to list all of the different solutions I encountered in one place.

I suggest trying each of these fixes one at a time, and then testing to see whether they fix the connection interrupted issue.

Let me know if it solves the problem for you, or if you know of any other fixes.

1. Enable ‘Auto-detect Proxy Settings’ option

  • In Firefox 3, go to Tools > Options > Advanced.
  • Click the ‘Network’ tab
  • Under ‘Connections’ click ‘Settings’
  • Tick the ‘Auto-detect Proxy Settings for this Network’ box
  • Apply and exit.
  • Restart Firefox 3

2. Alter about:config setting

  • Open a new tab, and type about:config in the address bar
  • Click “I’ll be careful, I promise!”
  • Search for the value: network.http.keep-alive
  • Right click on this value and click “toggle” to change it to false
  • Restart FireFox

3. Update to latest Flash beta

  • First, make sure you have quit Firefox.
  • Now uninstall the current version of Flash installed on your computer (mine was version 9) – instructions are available from Adobe at this link.
  • Shutdown and restart Vista
  • Now, download and install Flash 10 beta from this link.

4. Disable IPv6 for your network connection

  • Press and hold the Windows key and type R
  • Enter “ncpa.cpl” (without the quotes) and press Enter
  • Right click on your network connection and select “Properties”
  • Remove the checkmark from the box next to “Internet Protocol Version 6 (TCP/IPv6)
  • Click OK to exit the dialog
  • Restart Vista

5. And if the above fails, check your Internet security software and firewall

This includes antivirus and antispyware programs, firewalls, and more.

The issue of connection problems following upgrade can sometimes be caused by a security program not recognizing the update and blocking the connection to it.

Most of the time you can open a program’s settings, remove Firefox from its “Allow” list, and then let it redetect Firefox, and things will start working again.

Mozilla have a useful guide with some suggestions on how to do this here.  If all else fails, definitely try this link as it is probably the most comprehensive resource on the net for dealing with Firefox connection problem!

Categorized as Technical


  1. I tried all the solutions and none work, but besides that trying the 4th solution named “disable IPv6 for our network connection” now I’ve got a new problem, I cannot check anymore the mark for TCP IPv6…
    anyone have a solution?

  2. Hola, instale la version 3 de Firefox y me mandaba el error The connection has timed out, la desintale e instale la version 2, y lo mismo.

    Di con esta pagina e intente la primera opcion con Firefox 2.

    1. Enable ‘Auto-detect Proxy Settings’ option
    In Firefox 3, go to Tools > Options > Advanced.
    Click the ‘Network’ tab
    Under ‘Connections’ click ‘Settings’
    Tick the ‘Auto-detect Proxy Settings for this Network’ box
    Apply and exit.
    Restart Firefox 3

    Y resulto magnifico!!!!
    Funciona de manera excelente ya que hice esto, muchas gracias!!

    It works for me, thank you!!!

  3. Thank you very much. The solution number 1 worked fine for me.

  4. Where can I find “Auto-detect Proxy Settings for this Network’ box.” When I click on connections, I get FoxyProxy options but auto-detect proxy settings for this network is not there.

  5. I have tried all 5 of those methods and would like to say that none of them worked. Im highly upset with this issue and think I am loosing it LOL. If anything new comes around, would you please E-mail me. I left my addy. I also have this page bookmarked and will try back several times to see if its updated. Thank you.

  6. I tried all these suggestions except for #3, because I already have Flash 10 installed, not Flash 9. The suggestions don’t work and they have nothing to do with Mozilla Firefox because I also cannot surf to various sites using Google Chrome or IE. Other sites load very slowly or in odd ways – for example, nytimes.com will now only load as text-only. There are no pictures and only barebones HTML.
    This problem started when I woke up this morning and found I could no longer send or receive email in Windows Mail. I had full email capability the night before and did not do anything to change that. What I think happened is Windows Vista installed an automatic update which has totally f—ed up something that I don’t know how to fix. I don’t even know where to look. I have tried everything I know. I used System Restore to reset everything to 2 days ago, before the Windows update. I have turned off the firewall. I have disabled parts of AVG and tried to turn it off, but it doesn’t appear to be turn-off-able. Next I will try uninstalling AVG to see if that works.

    The CSR at my ISP didn’t know what to do either, but at least he escalated the ticket instead of just turning his back and telling me I’m on my own, like they usually do.

    You try to be responsible, keep on top of things.. Windows wants to install an update. “Of course,” you think to yourself, “by all means. That would be being responsible and keeping on top of things.”

    I have installed 2 Windows Vista updates since getting this computer. The first one did something to my network card which prevented me from connecting to the internet until I used System Restore. And the 2nd one is even worse..

    That’s the last Windows update I’ll ever install.

  7. I tried all of above with no sucess. Unable to acess just 1 website. Finally re-googled the error message discussed above and noticed one comment about re-booting modem. I re-booted router and dsl modem and hey presto – all worked as normal !!

  8. @rachel / @doublezero

    Do you have Zone Alarm installed on Windows Vista? If so, you might like to try uninstalling it and either use an alternative firewall such as Comodo or the Windows default firewall.

    There are reports elsewhere on the ‘Net that a recent Windows Vista update may conflict with Zone Alarm (and possibly other firewall software).

  9. do you have any other suggestions? I tried the 5 ways but none of them worked…
    thank you

  10. I can’t access my site. Still now after following your suggestion. Now what can I do? Pls suggest me…

  11. rebooting my modem worked..thanx

  12. try to turn off “QoS Packet Scheduler” in Local Area Connection Propertis

  13. Wayne R Bird says:

    Rebooting my modem worked, Thanks!

  14. Wayne R Bird says:

    Rebooting my modem no longer works:(

  15. Internet Connection Issues!

    i keep getting the following stupid message once i connect using my router or hardline

    “The connection has timed out

    The server at uversecentral3.att.com is taking too long to respond.

    The site could be temporarily unavailable or too busy. Try again in a few
    If you are unable to load any pages, check your computer’s network
    If your computer or network is protected by a firewall or proxy, make sure
    that Firefox is permitted to access the Web.”

    but once i tether my connection to my android it works just fine someone pls help.
    i dont even have att as my fucking isp either

  16. Thank you very much. The solution number 1 worked fine for me.Wasted a lot time 4 fixing this problem…& it work fine

  17. i tried all the above none worked.

  18. i try all the above none worked

  19. I appreciate, cause I found just what I was looking for. You have ended my 4 day long hunt! God Bless you man. Have a great day. Bye fefdaegadbkd

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