542951 - Password prompt constantly repeating while browsing behind a proxy

Status: RESOLVED DUPLICATE of bug 602814

(Firefox :: Security, defect)

Description

[Dariem Pérez Herrera]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)

After I upgraded to Firefox 3.6, every time I try to navigate the web behind my institution proxy (squid), I'm constantly prompted for entering a password, which it seems to be saved because I just have to click OK, but still, it's really annoying. I suppose the authentication type used is NTLM (authenticating against Active Directory), but I'm not quite sure.

Reproducible: Always

Steps to Reproduce:
1. Try to navigate through a squid proxy with NTLM authentication enabled.
Actual Results:  
A very frequently password prompt, with my authentication data already introduced.

Expected Results:  
Only one password prompt at the beginning of the session.

Comment 1

[Stefan]

I can confirm the Problem.
Firefox 3.6+ can not access NTLM protected webpages, when a proxy is used.

Proxy Setup:

 * I tested squid 2.6 and 3.1 (both have "connection pinning" feature for NTLM passthrough)
 * proxy_auth is not used

Results:
* IE works fine with both squid versions.
* Firefox 2.0, 3.0 and 3.5 work fine with both squid versions.
* Firefox 3.6 and 4.0_beta keep prompting for valid credentials when either of these 2 squid versions is used.
* Firefox 3.6 and 4.0_beta work fine when no proxy is involved.
* Changing "network.automatic-ntlm-auth.trusted-uris" for automatic NTLM Logon doesn't change the buggy behaviour.

Comment 2

[Stefan]

This is most likely a Duplicate of Bug 602814.