I have a DIR 632 router. I use it with a remote access program called ScreenConnect. In the configuration I have port forward for ports 8040 and 8040 which is required by ScreenConnect.
When I sent out a request for a customer to connect - the first time the connect happened wit no problems. However the second request the customer could not connect. Two more tries resulted with no connections being made. I reset the router and ran through the configuration again, and had the same thing happen. The first customer was able to connect and i was able to work on their system no problem. After that I could not get anyone to be able to connect. This works by sending an email to the customer with my external IP address. When they cannot connect they get a message saying they cannot connect the address listed. My internal IP address i locked down so it does not change since the port forwarding is set to a given IP address, 192.168.0.103. This problem has me totally baffled so if anyone can help I would really appreciate it.