Thanks for the reply! The major problem is, that the changes in Security Policy of Windows 7 hasn't changed a thing. But I will try it again, therefore my question. I am also unsure, because in Windows 7 a new WinHTTP Version is included, which may also cause problems. Is there anything, which should be considered, configuring/activating NTLM and Kerberos at the same time in Squid? Kind regards Wolfgang -----UrsprÃngliche Nachricht----- Von: Amos Jeffries [mailto:squid3@xxxxxxxxxxxxx] Gesendet: Donnerstag, 03. MÃrz 2011 03:56 An: squid-users@xxxxxxxxxxxxxxx Betreff: Re: NTLM/Kerberos Authentication with Windows 7 On Wed, 2 Mar 2011 13:58:04 +0100, Henickl Wolfgang wrote: > Hello, > I am looking for a solution of strange Problem. It seems that WinHTTP > Programs under Windows 7 tend to use Kerberos Authentication, instead > of > NTLM. The problem is, that I am working behind a Squid Proxy that is > only configured for NTLM. > > Do somebody know which settings I should modify? > Is there a setting required for "Network security: LAN Manager > authentication level" under Windows 7? > Are there known problems with such a configuration or any FAQs for > troubleshooting such environments? Sounds like you have found the problem already. The solution is to either disable the Kerberos security on Windows 7 (rendering the network back down to NTLM / NT 4.0 LanManager security levels) or upgrade your squid to accept Kerberos. The squid wiki has config tutorilas on Kerberos for Squid. It's usually not too painful add in parallel with NTLM. Amos