When attempting to run a master/worker run, you may get the following error: 


"Unable to start master status service: A TCP error (10013: An attempt was made to access a socket in a way forbidden by its access permissions) occurred while listening on IP Endpoint=<IP ADDRESS>:<PORT> Unable to start master status service: A TCP error (10013: An attempt was made to access a socket in a way forbidden by its access permissions) occurred while listening on IP Endpoint=<IP ADDRESS>:<PORT>"


The error indicates the Port number is being used by another service or application (Port 8081 is commonly used by Internet Information Services (IIS) Manager). To resolve this, do the following:



1. Change the port used for “Run Progress Port” in Worker Service Manager to 8085 (or another free port).

2. Save the settings in Worker Service Manager.

3. Restart Studio and it should work.


Or


1. Change the port used by IIS (or another application / service) is using from 8081 to another free port.

2. Stop and restart the offending service / application.


NOTE: The ports in use can be found by running Resource Monitor and looking at the TCP Connections / Listening Ports panels.