Hi Markus, > If you have a Windows client and the proxy send WWW-Proxy-Authorize: > Negotiate the Windows client will try first to get a Kerberos ticket and > if that succeeds sends a Negotiate response with a Kerberos token to the > proxy. > If the Windows client fails to get a Kerberos ticket the client will send > a Negotiate response with a NTLM token to the proxy. Unfortunately there > is yet no squid helper which can handle both a Negotiate/Kerberos response > and a Negotiate/NTLM response (although maybe the samba ntlm helper can). > So there is a fallback when you use Negotiate, but it has some caveats. This is not true when Squid is running on Windows: the Windows native Negotiate Helper can handle both Negotiate/Kerberos and Negotiate/NTLM responses. Regards Guido Serassio Acme Consulting S.r.l. Microsoft Gold Certified Partner VMware Professional Partner Via Lucia Savarino, 1 10098 - Rivoli (TO) - ITALY Tel. : +39.011.9530135 Fax. : +39.011.9781115 Email: guido.serassio@xxxxxxxxxxxxxxxxx WWW: http://www.acmeconsulting.it