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Problem setting up firewall rules for the Network License Manager.

Question asked by Magnus Hammar on Dec 17, 2014
Latest reply on Dec 17, 2014 by Magnus Hammar

I have a problem setting up the firewall rules for the license manager. The problem is essentially that I need to open two ports but that the second port seem to be dynamically assigned by the server process so it changed and render the client suddenly unable to acquire a license.

 

On the server I have two processes

PORT 25734: lmgrd.exe from Flexera listening

PORT 49199: sw_d.exe from Dassault listening

 

The problem is that last week the sw_d.exe was listening to port 49196.

 

Using a packet sniffer I looked at what the SolidWorks SolidNetWork License Manager does. Selecting the server in License Usage -> Server -> Dropdown triggers two identical (initially) requests. First to Flexera on port 25734 then a subsequent request to the Dassault process on 49199. The Dassault stream does continue to chatter and exchange information about serial numbers etc...

 

Can anyone explain this or even provide a solution for the jumping port number?

/Magnus

 

Side note: I am a bit surprised that the serial numbers are transmitted in clear text over the network. Not a big deal for us and it's not state secrets, but anyway...

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