We have an account lockout policy on our domain which was put in place purely to stop brute force attacks. It locks out an account for 10 minutes after 50 bad logon attempts within a 10 minute period.
Just recently I've noticed that my domain account was being locked out periodically, and with the help of the Microsoft Account Lockout Tools, I've managed to track it down to when I create a VPN connection from my desktop PC into a customer's network.
The account I'm using on both domains has exactly the same name. Our AD is Server 2008 R2, and the customer's AD is 2003 R2. The remote endpoint is a PPTP tunnel hosted by a 2003 R2 server.
Our network is routed, and the customers network is a flat /24 network. I've disabled all protocols other than IPv4 for the VPN connection (as I only use RDP once connected), and have disabled 'Use default gateway on remote network'.
Short of renaming my account on one of the systems, is there another way of fixing this?
Note this never used to be a problem, up until recently when my desktop PC was upgraded to Windows 7.