Cheers for the responses guys! Christoph: Yeah, my browsers pointing in the correct place. I had a look at the 'ps' command, is that for process threads? I added the 'f' switch as it sound cool, which turned up a main instance of squid with a child, the child also had its own child, which in turn had about ten to fifteen children. I moved on to try "/usr/lib/squid/ncsa_auth /etc/squid/proxy_users", fumbled with it for a while, then click with it! It's validating the passwords fine. > <cough> ;) lol, it's hard coded into the exchange, sorry. Ghislain: Cheers, I've ran a test to see if IPCop configures squid. From it's GUI I can change the proxy port, this changed the squid port in the squid.conf, I assume it makes the necessary adjustments to the IPTables, I shall learn how to read these then verify this. Jakob: Hi, Squid was installed and configured during the IPCop install. I am now going through the install to lock down its configuration. All paths given are correct and all files exist. Proxy_users is a file with "USER_NAME:MD5_ENCRYPTED_PASSWORD" per user, per line. Shall I post the config's? I have one which works and another that tries to use authentication and produces the aforementioned error. Yet again, thanks everybody Si Sydney Mitchell Solicitors does not accept service by email or fax. This email transmission may contain confidential or legally-privileged information that is intended for the individual or entity named in the email address. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or reliance upon the contents of this email is strictly prohibited. If you have received this email transmission in error, please reply to the sender, so that we can arrange for proper delivery, and then please delete the message from your Inbox. Thank you. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________