This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

username and password are being requested by

  • 1 reply
  • 2 have this problem
  • 8 views
  • Last reply by cor-el

more options

I can't open my firefox browser. An authentication required message pops up saying- a username and password are being requested by https://proxyvip.econ.mpg.de:444. The site says "Radius" - What do I do to get firefox working again? i can't do anything with it

I can't open my firefox browser. An authentication required message pops up saying- a username and password are being requested by https://proxyvip.econ.mpg.de:444. The site says "Radius" - What do I do to get firefox working again? i can't do anything with it

All Replies (1)

more options

You can check if you can start Firefox in Safe Mode by holding down the Shift/Options key.


See if you can use the Profile Manager to start Firefox in Offline mode.

Try to start Firefox with the about:blank page by creating a copy of the current Firefox desktop shortcut and add a space and -url "about:blank" to the target/command field.

If that allows to start Firefox then check the connection settings.

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":