RRAS License Error (Exceeded Client License Limit)

I have an intermitent problem whereby when my Main Office Server 2k3 attempts
toconnect to our Branc Office 2k3 SBS Server I recieve a 20097 Event and fail
to connect, the description says "A user was unable to connect on Port
VPNX-XX. No more connections can be made to this remote computer because the
computer has exceeded its client license limit". However I changed the
credentials after a couple of reboots and getting the same error and was then
able to connect successfully. I have checked the original account and it has
dial-in privelidges and is not locked out, my remote access policy allows
this connection and user.