574604 - network.auth.use-sspi = true is manadatory to make negiotiate authentification work

Status: UNCONFIRMED

(Firefox :: Settings UI, defect)

Description

[Matthieu Patou]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.4) Gecko/20100611 Firefox/3.6.4 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.4) Gecko/20100611 Firefox/3.6.4 (.NET CLR 3.5.30729)

Various articles on internet and documentation of firefox indicate that the parameter netwok.auth.use-sspi should be desactivated to make negotiate authentication work (also called sso). 
It is not true because with this parameter it's working. 
It's quite the opposite in fact, deactivating this parameter makes the negotiate authentication  unavailable (it leaves only the basic mode).

The Linux version of firefox is able to make negotiate mode working as the sspi libs are not available on this platform.

Reproducible: Always

Steps to Reproduce:
1. set network.auth.use-sspi to false
2. open a site using kerberos authentication 

Actual Results:  
a dialog box for entering password appear when the user credential should be just transmitted to the server.