This is a bit of an obscure bug: Mozilla can not log into a passworded website using basic auth, if the site closes the connection between the 401 Authorization required and when Mozilla prompts for a password/tries again. The problem seems limited to Solaris, or perhaps Unixes in general. I've not been able to produce this bug using a Win32 build, but have been able to do so on two different Solaris boxes against two different webservers. If you go to the above URL, you'll be prompted for a username and password. Notice that in the console Mozilla will claim to have loaded the document successfully, when it has not. Enter the user/pass (snog/snuh) and notice that Mozilla does nothing. I can cause and remove this effect by adding/removing this line from my Apache httpd.conf: BrowserMatch "Mozilla/5.0" nokeepalive If you put the user/pass in the URL: http://snog:snuh@www.bofh.halifax.ns.ca/mozilla-test/ ...ugh ...it will load fine.

And once again I forget the build ID. This is the Solaris 2.6 nightly, build ID 2000091921.

It's a dup of bug 53182. But here it's more acurately described. I can reproduce it on Linux.

*** This bug has been marked as a duplicate of 53182 ***

Verified dupe.