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Old 02-05-2007, 09:02 AM   #1
Registered: Aug 2005
Distribution: Arch Linux
Posts: 291

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Exclamation Transparent proxy with AD authentication


My installation specs

CentOS 4.4:

squid 2.6.stable8


I am trying to authenticate squid users on Active Directory. I have setup Samba, Kerberos, Squid for this.

Joining the domain worked fine. Kinit command also authenticates without any errors.

I have these lines in my squid .conf file:


auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 30

auth_param basic program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
auth_param basic casesensitive off


acl authenticated_users proxy_auth REQUIRED
http_access allow authenticated_users


/var/run/winbindd (recursively) has the privileges "root:squid"

Inspite of this transparent authentication does not work.

"wbinfo -t" gives the following output:


checking the trust secret via RPC calls failed
error code was NT_STATUS_NO_TRUST_SAM_ACCOUNT (0xc000018b)
Could not check secret


This obviously indicates some problem.. but i am not able to figure out what.

Please advise. I would be glad to provide more details.
Old 02-06-2007, 08:25 PM   #2
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I'm not sure that it should work that way. According to the Squid FAQ, proxy authentication does not work with transparent proxying.
Old 02-07-2007, 07:40 AM   #3
Registered: Aug 2005
Distribution: Arch Linux
Posts: 291

Original Poster
Rep: Reputation: 47
By transparent Proxy i mean that the IE does not challenge you for your User name/password unless your PC is not a member of the AD domain. I have already Implemented this on RHEL4 with squid v2.5 and it is working perfectly fine. Only same thing does not work here on CentOS.

This link could be referred for implementing this.

However it is not working for me as desired.


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