Unable to open debugger port in Intellij IDEA 2017-10-17 04:16

When I start tomcat to deploy my application I got the error message like following.

Error running '<application_name>': Unable to open debugger port (127.0.0.1:57214): java.net.SocketException "socket closed"

Solution

Open right bottom Event Log window. My Event Log is here

16:01	Error running '<application_name>': Address localhost:8080 is already in use
16:01	Error running '<application_name>': Unable to open debugger port (127.0.0.1:57214): java.net.SocketException "socket closed"

Check the port can not open.(In my environment, the port is 8080)
Change the port or close the application which use that port.

How to change the tomcat port in IDEA ?

Edit Configurations
Server tab to change http and JMX port
Startup/Connection tab choose Debug to change debugger port.

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