Recently, any attempt to log on to any site with my valid userid and password fails with FireFox but passes with Internet Explorer. What could possibly cause this?

I used FireFox a long time for email and other scure sites. Out of the blue my logins started rejecting. In frustration, I went back to Internet Explorer and found I could log in using the same UID and PWD.
I cain't imagine what setting could be causing this to happen. Have you ever heard of such a thing? And is there a solution?

In Firefox 3.6.4 and later the default connection settings have been changed to "Use the system proxy settings".
See "Firefox connection settings" in [[Server not found]]
You can find the connection setting here: Tools > Options > Advanced : Network : Connection
If you do not need to use a proxy to connect to internet then select No Proxy
Another possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that,.
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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls

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