When trying to open firefox I always get "server not found".

After downloading Firefox I cannot get it to connect to the internet. I always get the message "server not found." I have tried all the "fixes" suggested online but without any luck. This is a new download and I have not used Firefox before now.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

Similar Messages

Why do certain of my Firefox windows start getting "Server not found"?

Several times a day, one or more of my many Firefox windows gets into a state where it gets "Server not found" whenever I try to browse to a new URL. Internet Explorer is not affected.
I usually run Firefox with ~4 windows and more than a hundred tabs. The problem sometimes affects only one of those windows. Sometimes I can solve it by closing and then reopening the window. Sometimes I can solve it by closing and then reopening Firefox. Sometimes I can solve it by rebooting.
It's hard to say when exactly this started. The computer is only two weeks old.
I have experimented with the solutions discussed here (played with my firewall, verified that I am not using a proxy server, network.dns.disableIPv6, network.dns.disablePrefetch): http://support.mozilla.org/en-US/kb/Firefox%20cannot%20load%20websites%20but%20other%20programs%20can
Has anyone else seen this? Does anyone have any suggestions?

Reload web page(s) and bypass the cache.
*Press and hold Shift and left-click the Reload button.
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Cmd + Shift + R" (MAC)
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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.

Tried to download Firefox twice but get "page not found" when I double click on the desktop icon

Have no idea why Firefox won't download. I have Windows XP (home version) with plenty of space on my hard drive. I want to change from using Internet Explorer to Firefox.

This worked for me
Sandeep Singh (Official Rep) replied to this problem:
Elements 12: Editor will not Open
Hi Kimberly,
Please follow these steps:
Try to rename SLCacje to Slcache.old
C:\Program Files (x86)\Common Files\Adobe
and
SLStore to Slstore.old
C:\ProgramData\Adobe\SLStore
and Right Click on the Photoshop Elements 12 icon and run as administrator
Let me know if this works.
Thanks
Sandeep

Regularly get "Server Not Found" then always works with a retry. Why

Regularly get Server Not Found" then always works with a "retry".
== This happened ==
Every time Firefox opened
== I started using Firefox

Issue
I have another kind of problem with Firefox
Description
Regularly get Server Not Found" then always works with a "retry".
This happened
Every time Firefox opened
I started using Firefox
Firefox version
3.6.3
Operating system
xp windoes
User Agent

Changed battery in laptop and now when trying to open dreamweaver cs3, I get "licensing for this product has stopped working"... contact customer support (thats a laugh). So what now?

Changed battery in laptop and now when trying to open dreamweaver cs3, I get "licensing for this product has stopped working"... contact customer support (thats a laugh). So what now?
it says: You cannot use this product at this time. You must repair the problem by uninstalling and then reinstalling this product or contacting your IT admin or Adobe customer support for help.
Well it seems I am only able to install this on a maximum of 3 computers so if I uninstall and reinstall I may have used up all three. What caused this in the first place?

And most licenses extend to 2 machines; not 3. Your computer's clock probably reset when you changed batteries. Is your computer's clock set to the correct date and time now?
See Activation & Deactivation Help
Nancy O.

Firefox won't open...keep getting "404 not found" WHY? HELP

firefox won't open...keep getting "404 not found" WHY? HELP

The 404 message usually indicates a web page can not be found. If you are seeing that message in Firefox then Firefox is up and running but either having problems connecting to the web or not finding a specific target page. Sometimes the address may be wrong, sometimes the site may not be available.
Have you written this message whilst using Firefox on another computer ?
See also the article
* [[error loading websites]] <-- clickable link --
On the problem computer, if it is a Windows machine it will probably have Internet Explorer, does that work ok ?
Is it one particular website you are having a problem with, if so what is that site, and what is the web address as written in the location bar. If it is many pages give at least two examples please.
Copy and paste the location bar contents into your post
* Keyboard key '''Ctrl + L''' (press the Control key hold it down than press the L key) that will highlight the location bar content, do that while trying to use the web page
* '''Ctrl + C''' copies the info to the 'clipboard'
* change to the message you are writing '''Ctrl + V''' pastes/inserts content at mouse cursor in your message

Frequently get 'Server not found', have tried all articles solution, what now?

Frequently get 'server not found' when accessing web sites, no particular websites just randomly all sites, clicking 'try again' always resolves. I am thouroughly sick and tired of this error and no working soloutions! Have tried 'about:config' settings; pipelining, script_run_time, ipv6. Have tried reinstall of Firefox and update of firefox. Have allowed firefox in my firewall which is 'Comodo' and have deleted entry and re-allowed it again. Have tried firefox proxy settings on all choices of settings. These things do not fix the problem. I cannot find anymore information or solutions to try, I have searched everywhere and everything and tried all the things Ive found as mentioned above. What is the problem? Can it be resolved? How can it be fixed?

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

When trying to start Firefox I keep getting message saying "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I've started a new Profile but Profile Manager keeps telling me the Default one is still in use.

When trying to start Firefox again I got a message saying "Close Firefox. A copy of Firefox is already open. Only one copy of Firefox can be open at a time." This question is addressed in Mozillazine but nothing I've tried from there seems to work. I started a new Profile from the Profile Manager which at least gets me up and functioning, but weirdly enough the Manager also tells me the old (Default) profile is still running, though I can't find a way to close it. I also can't find the Default profile in my profile manager. can anyone help?
== This happened ==
Just once or twice
== i thought I'd exited Firefox and was going in again.

Had this problem on my MacBook after I deleted my profile (the profile folder is named something like asd8f7as.default). The solution for me was to open profiles.ini and delete the information about the profile I had deleted. It should look something like this:
[Profile0]
Name=default
IsRelative=1
Path=Profiles/2xr4hi1g.default
Delete, save, problem solved.

Get error message "firefox is in offline mode, uncheck the work offline menu and try again " when trying to open firefox after downloading latest version of firefox

after downloading the latest version of firefox, when trying to open it I recieved the message, "Firefox is in offline mode. cannot browse web. Uncheck the work offline menu and try again". Have tried several times to open with same results. Have even uninstalled firefox and reinstalled latest version and still get meassage after trying to open.

thank you - that does make sense except i have another computer that connects to the internet in the same way but it doesnt happen on that one. i didnt change anything - it just started a couple of weeks ago after i updated firefox to 11.0. cant find any settings in firefox to alter either - thanks for the help

WHEN TRYING TO OPEN FIREFOX, GET MESSAGE PATFORM VERSON 8.0 NOT COMPATBABLE WITH MIN VERSION 7.D MAX VERSION 7.D

I AM TRYING TO OPEN FIREFOX, AND GET A URL MESSAGE: PLATFORM VERSION 8.0 NOT COPATABLE WITH MIN VERSION 7.D MAX VERSI 7.D

If you use ZoneAlarm Extreme Security then disable Virtualization and reinstall Firefox.
*http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
See also:
*[[/questions/880050]]

How to fix error loading webpage - keep getting "server not found" repeatedly & have reloaded firefox and tried everthing - quite annoying and did not have problem when I first began using firefox - I am ready to try another browser

How to fix "server not found"

Does this happen on all websites? If so then you may have to update the permissions in your firewall application to allow the new Firefox.

When i load a page i get "server not found", when i click retry it loads properly, what can i do to have firefox load page first time

When i load a page it often tells me "server not found". When i click on retry most of the time it works. How do i fix it so that it works the first time.
== This happened ==
Every time Firefox opened
== a couple months ago

You either have an extension that causes that issue or some security software (firewall) is causing a delay.
See [[Troubleshooting extensions and themes]]
Also make sure that Firefox gets full unrestricted access to the internet.
See [[Firewalls]] and http://kb.mozillazine.org/Firewalls

When I click on Mozilla Firefox I get server not found. When I ask for help I get server not found. Without my intention visual bee is in background.

I recently responded to a prompt to upgrade Mozilla Firefox and started seeing visual bee in background and got lookup for browser safeguard.com.com failed. Can't get into Firefox. My version is 3.6.12. Help requested. Thanks Keith

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

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

When trying to open firefox I always get "server not found".

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