594590 - FF 4.0b5 - https not working while behind a proxy

Status: RESOLVED DUPLICATE of bug 592197

(Firefox :: General, defect)

Description

[barbara]

User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5
Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5

Today I've updated from 4.0b4 to 4.0b5.
After that, while behind a corporate proxy requiring authentication, if I start FF and type and URL requiring a https connection I'm not asked for the master password to retrieve the saved proxy credentials anymore and apparently nothing happens. This doesn't happen for http connections, working as expected.
If I invoke a https URL after a successful proxy authentication (e.g. after visiting a http URL) apparently nothing happens, the tab just remain blank, page source show nothing, no error message is displayed. So I've no idea about what's happening.
Check for update reports an error, if I'm not wrong is "AUS Update XML File Malformed 200", but I can confirm tomorrow, while behind the proxy again, if really needed.
Same results starting with a fresh profile.
While not behind the proxy, FF works as expected.


Reproducible: Always

Steps to Reproduce:
1. start FF 4.0b5 while behind a proxy with authentication
2a. go to a page requiring https (e.g. https://addons.mozilla.org)
or
2b. go to a page not requiring http, you will be asked for proxy credentials
3. insert username/password a look a the page loading
goto 2a

Actual Results:  
Apparently nothing

Expected Results:  
Once authenticated against the proxy, the page get loaded

Comment 1

[Matthias Versen [:Matti]]

I assume that you use a NTLM proxy