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NTLM Performance question

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hi.

i've successfully got squid authenticating against our ad domain, and the restrictions on the squid server itself are by nt group membership.

i'm noticing that there is a heck of a lot of activity by the authenticating perl program when i run 'top'.

i've included the relevant lines from my squid.conf- is there something i ought to change here to enable better performance? presently it runs slower than our isa server and is on similar spec hardware. i wondered if there was some way of increasing the time it remembers a users details without re-querying the server?

thanks

john


#nt auth

auth_param ntlm program /usr/samba/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 15
auth_param ntlm max_challenge_reuses 0
auth_param ntlm max_challenge_lifetime 60 minutes

auth_param basic program /usr/samba/bin/ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm SuperSquid
auth_param basic credentialsttl 2 hours

external_acl_type nt_group ttl=0 concurrency=20 %LOGIN /usr/squid/libexec/wbinfo_group.pl



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