Mozilla Firefox: “The Proxy Server Is Refusing Connections”

Firefox - Invalid Proxy

In this case, Internet Explorer doesn’t even give a tip about the use of proxies. It just graciously fails to show your webpages. Mozilla Firefox has the ability to sense danger…

Why is it that these type of things always seem to happen whenever you are in a position whereas you would really need your precious Interwebs? I don’t even use a proxy server… I thought.

The obvious question we then ask ourselves is:
What does Firefox on my home computer need a proxy server for?
The answer is:
Nothing. Unless you have (had) any anti-virus/firewall software that were acting as one, like I did, but the poor thing never got to resetting the proxy settings after I removed it…

Unless you are perfectly sure of that you don’t need a proxy defined, please stop here and do some research on what kind of anti-viral software you may have on your computer. If you find that there are none that require the proxy setting defined as localhost/127.0.0.1, please continue.

Of course, there may be other organizations like universities that require the use of proxies in order to monitor/cache your web requests for quicker access. If this is the case and you’re not attending one right now (i.e not logged onto their networks), do continue.

Mozilla Firefox doesn’t listen to Internet Explorer’s proxy settings by default.
It will though, if the setting “Use system proxy settings” is checked, located at:
Tools –> Options –> Advanced –> Network –> Connection –> Settings

Given the “Use system proxy settings” was actually checked, and not the other options of that view in Firefox, you want to check the options found in Windows Internet Options:
Control Panel –> Internet Options –> Connections –> LAN-settings –> Proxy server
Optionally click Advanced if the fields Address and Port are disabled.

If any sign of a proxy setting seems to be enabled and you still are completely convinced that the rest of your network will function without one; please clear the checkbox that states “Use a proxy server(…)” in LAN-settings to disable the use of proxy servers.

When you’ve configured the aforementioned settings correctly, try accessing any webpage through either Mozilla Firefox or Internet Explorer. Preferably both, to be sure. If it still doesn’t work, consult your local IT department of any questions regarding their use of proxy servers.

I can guarantee you, I don’t run a proxy server at home!

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