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Error: Failed to initialize server endpoint: opc.tcp
February 13, 2025
15:37, EET
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ValentinL
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February 13, 2025
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Hello,

When I lunch OPC UA Simulation Server, I have the error: “ERROR: Failed to initialize server endpoint: opc.tcp://…..”.

I do not have another instance running on my laptop.
I checked the log file “simulationserver.log” : “Caused by: java.net.BindException: Address already in use: bind”

How should I fix the issue?

Best regards,
Valentin

February 14, 2025
10:05, EET
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Bjarne Boström
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Hi,

Some other application could have taken the port.

If you are on Windows, please also see https://forum.prosysopc.com/fo…..ine/#p7039 , copied below:
Hyper-V (and possibly some other software) does reserve some ports on Windows.
See https://stackoverflow.com/ques…..on-windows see the first 2 answers (in the second one there is “netsh int ip show excludedportrange protocol=tcp”), that should hopefully be able first see that the port was reserved (explains the issue) and then adding it to the excludes causes it to not be reserved anymore (you probably need to restart after adding the port number to the excludes).

February 14, 2025
11:34, EET
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Matti Siponen
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Hello,

If you’re on Windows, you can also use Resource Monitor’s Network tab to check which TCP ports are in use.

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