Here is my error message Mar 10 11:57:23 server squid(pam_unix)[23002]: authentication failure; logname= uid=117 euid=117 tty= ruser= rhost= user=jim Now for the strange part, the uid is for the squid proxy server and not the user jim
Did you set the 'pam_auth' authenticators owner-suid bit and is it owned by root? If you use shadow passwords (very likely you do), you have to have the permission to read /etc/shadow. In many cases only root and maybe a group 'shadow' or likewise is allowed to do that. Squid has to become one of them to validate the password you supply for user 'jim'.
HTH Heiko
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