I have created a user proxy in Centos from which i am running my squid successfully with all the rights properly configured until i change my configuration file for Negotiate/Kerboros. I am receiving the following error when trying to start squid: 2010/04/09 05:06:12| helperOpenServers: Starting 10/10 'squid_kerb_auth' processes 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| ipcCreate: /usr/sbin/squid_kerb_auth: (13) Permission denied 2010/04/09 05:06:12| Unlinkd pipe opened on FD 20 For trouble shooting I have just installed Strace and created a script as per Markus recommendations. --------------------------------------------------- #/bin/sh strace -f -F -o /tmp/strace.out.$$ squid_kerb_auth $* -------------------------------------------------- Now i have no idea how to use scripts from within squid.conf. And at which place should i place this script in the squid.conf in relation to the following? auth_param negotiate program /usr/sbin/squid_kerb_auth regards, Bilal Aslam _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969