"Server not found" error on every site after some use, the pages work fine in other browsers

I'm getting the "Server not found - Firefox can't find the server at blablabla.com" error after using Firefox for a while, sometimes 30 minutes, sometimes 2 hours. This error appears on every single page, and does not go away until I restart Firefox. Google Chrome can load these pages with no problem, so it's not a problem with my internet connection. I've already done everything on this page:
http://support.mozilla.com/en-US/kb/Server%20not%20found
And it did not help at all.
I have not installed any new extensions, plugins, userscripts or anything like this, and everything was working perfectly fine until a week ago.

I've encountered 404 errors and xmarks keeps popping up when I try to open igoogle.
All of the is in Firefox4.0 Beta 8.
I don't have any problem in Chrome, no 404 errors, no xmarks showing up when it should be the igoggle search page.
Most disconcerting.

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On Mac with Firefox 4, apostrophes in the text are not handled right. The page works well on other browsers.

See www.researchintegration.org/lynn-home.htm, "Queen's" on third line under "Education."
Also www.dsescale.org, in the paragraph starting with "Religions", Firefox 4 is not handling the umlauted "u" in "Arndt Bussing".
These pages have always worked right in other versions of Firefox. As far as I know both of these locations are coded with proper HTML.

That is a problem with detecting the encoding properly. You can change that manually to View > Character Encoding > Unicode (UTF-8) or try the Auto-Detect > Universal setting.

"500 server not found" error on Windows 8.1 when accesssing my website (works with Mozilla on Windows 7 and with IE on 8.1)

New Surface Pro 3 running windows 8.1 (works with Windows 7). Firefox 34.0.5 is browser. Cannot access my website only. Have cleared cache. Works with Internet Explorer.

Thank you. Since the website can be accessed by other browsers (Internet Explorer), I believe the problem likely is in Mozilla's configuration settings--I just don't know how to fix them!

When I insert a screen shot or image into the body of an email (not an attachment), why does it not show up after being sent? It works fine in other browsers.

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try reinstalling iTunes.

In Firefox, I keep getting "Server not found" error - CONSTANTLY!

Two days ago I started getting the "server not found" error, off and on, daily. It is happening on both my desktop iMac 10.7, and my Windows 7 laptop. I keep having to hit the "Try Again" butting, and sometimes, several times, before a web site will finally launch. The only two extensions I have on both, are the Adblock Plus and the Last Tab Close Button, both of which, have been installed on said computers for months and months and months.
I went in and changed a setting to the "auto detect proxy setting", hoping that would work, and it did not.
I have Firefox version 21 on both computers, and it seems the problem started shortly after this latest Firefox update, and at the SAME TIME on both computers.
I do not have virus protection on my iMac, nor on my Windows 7 laptop, at the moment, but I have run online software to check for anything, and no issues, so I believe, it is not that which is the issue.
The firewalls on both computers are working fine and no issues there either, I have not changed any firewall settings, on either computer. It couldn't be the firewall, in my opinion, because this annoying error message started happening on BOTH of my computers, at the same time; I work on my iMac in the morning, then switch to my laptop in the afternoon, and same issue continues on both, and started at the same time, on both.
Is there something broken in Firefox from this last update of the browser?
Does anyone have any suggestions as to why both computers are having this issue, at the same time?
I have not tried using I.E. yet on my laptop, I rarely have ever needed to use that browser, and I hate it, so I don't use it.
Any help or suggestions, would be appreciated.

I followed those steps, but clearly some steps are missing. How do you "enable each extension one at a time"? The only choices I see in Safe Mode are "disable" and "remove."
And why is it that every other update to Firefox breaks Firefox? I've had to install add-ons just to be able to use it in Windows 8 with a touchpad.
Now that I think of it, it doesn't even matter any more. After years of Firefox loyalty (even after Firefox users have dropped to 28%), I'm off to download Google Chrome (up to 52%). I'll miss Firefox, but not the on-again, off-again performance.

Getting "server not found" errors randomly. If I reload the page comes up fine. Why?

I'm on a Mac running 10.6.5 and using Firefox 3.6.13. All of the sudden pages I visit all the time are coming up with "server not found" errors, but when I refresh the page comes up fine. Sometimes the page loads, but in html code and all jumbled.
How do I fix this? Very annoying. I've been using Firefox for years and it's never done this. Nothing's changed with my connection or settings.

You detailed the situation very well dezi.
Amazing that so many people have this problem yet NONE of these so called "AWESOME" developers deem it important enough to address the issue.
I still have the exact same lame problem as you with 3.6.whatever it is now.
There are quite a few of these random"Server not found" threads scattered around here,all with a mounting number of "people have this problem"
On my old MacBook Pro, which runs 3.5.16, I have no such issue.
After 6 weeks of exhaustive research the only thing I have found is a fix aimed at PC users in which you alter the about:config settings (not that it would work for us or that if it is even possible) that affect something called DNS fetching. I am not a computer person so all the jargon about do this-do that goes over my head. However, to get this solved I will learn what it takes.
I hope we get some real answers soon
(and none of that "empty your cache and cookies" garbage either)
Signed,
Frustrated as hell

Random "Server Not Found" errors.

Since I updated to the most recent version of Firefox I'm randomly getting "Server Not Found" errors when I try to navigate to sites via searches, direct links, and typing in the URL. Anyone know what's going on?

Adding som info whilst bumping the thread:
the 400 Error page renders with:
400 Bad Request, The HTTP client sent a request that this server could not understand.
the 404:
404 Not found, The requested URL /apex/f was not found on this server.

Intermittent "Server not Found" errors

For the past week, I've been getting intermittent "Server not Found" errors. It'll happen when going to a site. I re-read the site and it might open to it. Go to another site, it works fine. Go there a minute later and "Server not Found." Just started last week, and I've found no real answer online. I've found a lot of people discussing this, but no real, solid solutions.
== URL of affected sites ==
http://

One of your add-ons might be the culprit too. Try running Firefox in [[Safe Mode]] with all add-ons disabled. If that solves the problem, see [[Troubleshooting extensions and themes]] and possibly [[Troubleshooting plugins]]

Desktops get "Server Not Found" errors with WRT160N

I'm sharing my WRT160N with 2 laptops and 3 desktops. My laptops connect to the internet ok... drops now and then tho... but my desktops frequently get a "Server Not Found" error. After repeated "try again" clicks, it eventually connects again. Any ideas??

Try this ;
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type - 192.168.1.1 and press Enter...Leave Username blank & in Password use admin in lower case...
Under the Setup Tab...reduce the MTU value to 1300 and save settings.
Also reduce the card speed of the dekstop... (assuming it is window XP)..Click on the Start button >>> Control Panel >> Network Connections >> Right click on the ""Local Area Connection"" icon and select properties-Here click on the "Configure" button- Click on the "Advanced" tab- In the "Property" box highlight Link speed and duplex/Connection type/Network or Media type- And in the "Value" box select 10 Mbps half duplex/ 10 base T/10 base half mode and click on OK.. Now restart the computer.

Can I go back to the old look of the 'server not found' error messages?

After updating to Firefox 32, I noticed that the 'server not found' error messages now look differently. I don't like the new look, so I wonder if you know about an add-on that restores the old look. I've tried searching for it, but I don't know the proper name of these error messages, so I'm not sure what search phrase I should use.

To recall what it looked like before, I did a search: [https://www.google.com/search?q=server+not+found+picture+firefox&client=firefox-beta&hs=wiy&rls=org.mozilla:en-US:official&channel=fflb&tbm=isch&tbo=u&source=univ&sa=X&ei=QUIXVPz7Eou7ogSl8YD4Bg&ved=0CB8QsAQ&biw=1036&bih=554#facrc=_&imgdii=_&imgrc=dFf2lmJRgVlgyM%253A%3BS3EdEuvyajjWqM%3Bhttp%253A%252F%252Fi.stack.imgur.com%252F2ZJR2.jpg%3Bhttp%253A%252F%252Fsuperuser.com%252Fquestions%252F584305%252Ffirefox-says-server-not-found-because-its-adding-www-how-do-i-stop-this%3B851%3B455 Images of Server not found in Firefox]
I did not find an addon, but I did find an old hack for the profile folder in this thread: [http://forums.mozillazine.org/viewtopic.php?f=7&t=492177&start=0]
EDIT:
There was also [https://addons.mozilla.org/en-US/firefox/addon/errorzilla-mod/ ErrorZilla addon]

Can't do online banking. Get error message. "The requested URL /Summary.cgi was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I can't do online banking. When I try to open the page I get error "The requested URL /Summary.cgi was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Hi,
These blog posts might help debug problem
Oracle APEX: Got a 404 Not Found? | Inside Oracle APEX by Patrick Wolf
daust_de :: Oracle XE / APEX: Troubleshooting the 404-not found error on XE
Regards,
Jari

I can't fix the "Server Not Found" error

Ok, when I started up Firefox I was greated with a "Server not found" error, so I thougt to myself, " Ok, I'll just follow the instructions shown". Didn't help, still didn't work. So I dcided to use Internet Explorer until the issue fixed itself, didn't work. So I tried the 64 bit version, that worked. So basically what I'm trying to ask is: is there a 64 bit version to Firefox, or is another solution what i need?

Close all of your anti-virus software and restart your FF.
Also see [http://www.yanfei.info/2011/07/firefox-link-error solution of connection was reset] for more help .

Random Server not found error in firefox

for the past few days i have been having the "Server not found" error in firefox whilst browsing it happens at random and fixes when i restart the browser or reconnect my internet connection

mersne wrote:im not sure since as i said closing and reopening firefox fixes it so i cant trust any other browser and i cant simply switch since i dont k now if its affecting another browser or not
you can't trust any other browser?
Try chrome at the same time. See if it works, when firefox doesn't.

Server not found error message

This is the second time I've "posted" this problem. Maybe the first time didn't take.
I get SERVER NOT FOUND error message.

What main page? I take it you did not write your message on the bad
Firefox. There are several things that could be the problem.
Some problems occurs when your Internet security program was set
to trust the previous version of Firefox, but no longer recognizes your
updated version as trusted. Now how to fix the problem: To allow
Firefox to connect to the Internet again;
* Make sure your Internet security software is up-to-date (i.e. you are running the latest version)
* Remove Firefox from your program's list of trusted or recognized programs, then add it back. For detailed instructions, see
'''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet?esab=a&s=Configure+firewalls+&r=0&as=s Configure firewalls so that Firefox can access the Internet.]''' {web link}

404 Not Found error was encountered while trying to use an ErrorDocument to handle the request

When I try to go to my website, I get a blank screen and this message:
Method Not Implemented
GET to / not supported.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Can anyone help me fix this bug, please? Thanks!

I did as you said and it worked magic! I didn't even have to restart Mozilla. Thank you so much for your help! :-)

"Server not found" error on every site after some use, the pages work fine in other browsers

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