How to fix this issue?

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I am right now trying to run my application locally and I am facing this issue :) . How to fix it? And I am pretty sure 8090 is not used.
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1 answers
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This usually happens when the Mendix runtime cannot bind to the configured port, even if it looks like 8090 is free.

First, verify whether any process is actually using the port.

On Windows:

netstat -ano | findstr :8090

If you get a PID, stop that process:

taskkill /PID <PID> /F

Also check if there is a previous Mendix runtime instance still running in the background. Sometimes Studio Pro closes, but the runtime process remains after a crash or forced shutdown.

If nothing is using the port, try:

  • close Studio Pro completely
  • check Task Manager for any remaining m2ee.exe / Mendix runtime processes
  • start the app again

As a quick workaround, you can also change the runtime port from Studio Pro:

App Settings → Configurations → Edit → Server → Runtime Port

and test with another port like 8091.

Kindly mark this as the accepted answer if it helps.

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