Created attachment 424444 [details] emerge --info After upgrading squid from 3.4.11 it looks like the ntlm_auth with --require-membership does not work anymore: I have this in squid.conf: auth_param basic program /usr/bin/ntlm_auth --require-membership-of="SID" --helper-protocol=squid-2.5-basic and see that in cache.log: Could not parse "SID" into seperate domain/name parts! Also using DOMAIN\group od DOMAIN\\group does not work. Invoking ntlm_auth by hand is still working: ntlm_auth --require-membership-of="SID" --username=myuser --domain=mydomain password: NT_STATUS_OK: Success (0x0) So looks like a bug for me.
After downgrading to 3.5.6 I see the same behaviour. It is also not working.
This appears to be a Samba bug. The Samba ntlm_auth helper is not part of Squid.
Closing. reopen (as samba bug?) if needed.