I've been using NTLM Authentication through squid for a long while now and love it. Recently a Java app has wanted to use it as well (using browser settings to determine proxy settings) yet when I enter in data for the username, password and domain fields, it never correctly authenticates. Is Java sending different NTLM fields to Squid then what IE normally sends? Is there a different "helper protocol" that would work better than what I've currently got set in squid.conf: auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp I've googled and found this work-around but was wondering if there wasn't something that wasn't so easily forgable by the clients: acl Java browser Java/1.4 Java/1.5 http_access allow localhost Java