Hi I am using Squid 2.7Stable7 and trying to authenticate to a sharepoint server using NTLM. I have observed that sharepoint server sends a 401 status code with proper ntlm authentication headers to squid as follows WWW-Authenticate: Negotiate\r\n WWW-Authenticate: NTLM\r\n but squid doesn't forwards these headers to the Client browser in the 401 response to client. What could be wrong? There are no auth_param entries in squid.conf file. Squid was compiled with following options with no ntlm,basicauth support. '--enable-epoll' '--enable-snmp' '--enable-removal-policies=heap,lru' '--enable-storeio=aufs,coss,diskd,null,ufs' '--enable-ssl' '--enable-htcp' '--with-openssl=/usr/kerberos' '--enable-delay-pools' '--enable-linux-netfilter' '--with-pthreads' '--enable-external-acl-helpers=ip_user,unix_group,wbinfo_group' '--enable-useragent-log' '--enable-referer-log' '--disable-dependency-tracking' '--enable-cachemgr-hostname=localhost' '--enable-ident-lookups' '--enable-follow-x-forwarded-for' '--with-maxfd=16384' Regards, Saurabh