Hi can you post the question to squid users group (please read it and find if it is clear enough) We are using squid 2.5 and Samba suit 3.0.3 in conjunction with Active Directory and NTLM authentication. We also are using authorisation process for users based on active directory group membership. We have noticed that if user is a member of more 60-70 groups, squid/samba cannot determine his group membership. So as the result user is denied on squid proxy. If we limit number of the groups for the user to 40-50, the problem is solved. Does anyone know about any limitations in regards of group membership on Samba 3.0.3?