WAN to LAN issue

WAN to LAN issue
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andremta @ 25th Sep 10:28AM:
WAN to LAN issue

Hello,

We have a license application client(IBM/LUM) that connects to a license server outside our network.
The clients works this way... it binds a random port and tries to connect to the remote IP with UDP port 1515.

Through wireshark I could see that it reaches the destionation, although the way back is unreachable.

If I add this random port to our router Port Forward rule, it works perfectly. Although this is not a solution cause the port is changing every time.

Isnt this strange? Other applications open random ports as well and comunication is two-way reachable.

If I connect directly to the internet, it works perfectly as well.

What can I try to do with our ZyWall USG300 Router to fix this situation?
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