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Windows and Networking

If you are running EvoMaster on Windows for long periods of time, or if you are running more than one instance in parallel, you might get error messages regarding running out of ephemeral TCP ports.

This might happen because Windows has much more restrictive default settings compared to Linux/Mac when dealing with TCP ports. If you end up seeing these issues, you might want to use regedit to modify HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TCPIP\Parameters registry subkeys. In particular, add new REG_DWORD values for:

  • TcpTimedWaitDelay : can use something like 60.
  • MaxUserPort: can use something like 32768.

As this would impact your whole OS, we recommend doing such changes if and only if you start to see problems with EvoMaster related to ephemeral ports.