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Why doesn't my cell modem allow connections to my HMI, while a local connection is fine?

Issue:
Why doesn't my cell modem allow connections to my HMI?

Product Line:
Magelis HMI (all ranges with Ethernet)

Resolution:
When this issue occurs, here are some possibilities to explain why:
1) The port forwarding rules on the Cell Modem have not been setup correctly. Please check the configuration to ensure that the rules are set to push traffic to the correct IP.
2) The Cell Modem has not released a socket from a previous connection and is still holding it. Power Cycle the Cell Modem to reset the sockets.
 
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