Hi, I;m using wbinfo_group.pl from samba 3.4.8 for squid ntlm authentication because I'm using multiple samba groups squid version is 2.7 from debian Lenny squid.conf contains: external_acl_type nt_group ttl=0 children=5 %LOGIN /usr/lib/squid/wbinfo_group.pl -d acl AuthorizedUsers proxy_auth REQUIRED acl internet external nt_group "/etc/squid/allowed-groups" http_access deny !internet Allowed groups contains LAWCO\Internet%20Users GIBB\Computer This tests fine from command line echo "lawco\\nprice lawco\\Internet%20users"|/usr/lib/squid/wbinfo_group.pl -d But from squid it does not work, it seems that squid escapes the escape. I changed wbinfo_group.pl foreach $group (@groups) { $group =~ s/%([0-9a-fA-F][0-9a-fA-F])/pack("c",hex($1))/eg; #this next line added by me $group =~ s/%20/ /; $ans = &check($user, $group); last if $ans eq "OK"; } Probably horrify perl purists but it works for me. Hope this helps someone.