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I'm able to run debugger and send request from postman. I get valid response but debugger never stops at my breakpoints.

A while after I run debug, I get below pop-up window. It doesn't stop me from sending requests but it just won't stop at my breakpoints.

NOTE: I have work computer that uses VPN

Studio is not able to connect to Debugger server and Debugger not stopping at breakpoint.Tried below from similar forum topics:

Opened Firewall port 6666

Tried other ports (9999, 6667, etc)

Reinstalled anypoint studio (including previous version)

Tried earlier version of Mule 4 runtime.

Moved anypoint studio to a different directory.

Deleted workspace and retried with a new workspace

Also deleted .mule folder and Project > Clean

telnet localhost 6666 returns: connect failed

opened 6666 to allow inbound connection

ss2

6 answers
  1. Dec 22, 2025, 9:42 PM

    Was facing the same issue after upgrading to Version: 7.23.0 

     

    Right clicking the Project -> Properties -> On Mule Project changed Server Runtime from 4.9.11 to 4.10.1, accepted the dialogs (Anypoint crashed the first time, so I repeated the steps, second time worked).  

     

    After that right click the Project again -> Debug As... -> Debug Configurations on Target Server Runtime, select the same version 4.10.1. 

     

    Restarted Anypoint studio and debugger worked now.  

    They really need to up their support docs with better instructions, hope this helps.

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