Running 6.836 or attempting to anyway. When ever I enable remote authentication, doesn't matter to what AD or Radius the system stops working. I loose all network connectivity. If I log on locally ifconfig shows everthing as being fine and I can ping the Internal and External IP addresses. If I try to ping anything else, on the internal network or external, I get the message that "This operation is not allowed". If I reboot the system still no network connectivity and no errors are shown during bootup. Normally on the monitor that is attached to the computer I'm testing on after boot up it will show the IP address of the Internal connection. After reboot it doesn't show anything other than the logon prompt and the usual startup messages. I've checked the logs and I can't find any errors. Any suggestions? I'm running this on a Dell Optiplex GX-280, 1 gig RAM, 2 3com 3c905 network cards with a built in Broadcom NetXtrem 57xx. Using the 3Com's as my Internal and External connections.