Hi all again. I think we can close this threat couse i localize the problem. It's the same problem as in this threat - http://squid-web-proxy-cache.1019090.n4.nabble.com/Authentication-using-squid-kerb-auth-with-Internet-Explorer-8-on-Windows-Server-2008-R2-td3013070.html#a3013070 I check all on Windows XP with IE7 client machine and all works fine even with squid_kerb_ldap helper By the words, squid_kerb_ldap helper didn't start untill i give him -i key on the end of string external_acl_type SQUID_KERB_LDAP ttl=3600 negative_ttl=3600 ipv4 %LOGIN /usr/local/squid/libexec/squid_kerb_ldap -g UserGroup@xxxxxxxxxx -i Maybe it will be usefull for someone else. -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Problem-with-SQUID-KERB-LDAP-tp1468788p3013710.html Sent from the Squid - Users mailing list archive at Nabble.com.