Q100235: What to do if you get a "Connection refused at server" licensing error message
After setting up your floating license server and pointing your computer at the license server, the program fails to run and shows the following error message:
Communications error with license server (-17)
Connection refused at server (-11)
This error message will appear if there is a firewall between the license server and the client machine (the computer requesting the license).
The firewall may be blocking the license request by either closing the ports that the license request uses or by only letting approved programs on the server communicate with other computers.
You can fix this issue by changing your firewall settings to allow the license server and license requests to pass through it. This can either be done by opening the specified ports for the server or by allowing the RLM server program within the Foundry Licensing Tools (FLT) to communicate through the server.
Please see Q100216: How to Use A License Server Through a Firewall for more information about how to set this up.
If this does not resolve the problem then please open a Support ticket and attache diagnostic output files from the Foundry License Utility (FLU) for both the server and client machines. Please see the following articles for more information:
- Q100064: Using the Support Portal explains how to open a support ticket
- Q100105: Diagnosing License Problems has instructions on how to create a diagnostic file
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