Then indeed ip_conntrack must have a faulty connection in a bucket somewhere. You might be able to get rid of it by flushing your tables (reloading the firewall). Or rmmod the iptables modules.
I wouldn't worry too much about it though. It's probably the M$ client behaving badly, not sending FINs correctly, or something like that. Many M$ clients are known to not close their connections correctly. It could ofcourse also be a network hick-up, causing the client to forcably disconnect but never closing the connection on TCP/IP level.
A reboot or reloading of the ip_conntrack module should fix it. Again, don't worry too much about it. Better make sure your Terminal Services are configured with idle session time-out limits etc.
HI Sietse
A big thanks for this. Suppose im been a bit looney about this.
Suppose I should wait for the TTL to kick in (Wonder why its so high though)
192.168.10.100,3389 tcp ESTABLISHED 70:09:29
Thanks again.
Brent Clark