Unable to open debugger port in IntelliJ

Question

Unable to open debugger port in intellij. The port number 9009 matches the one which has been set in the configuration file for the application.

Answer 1

Try to connect with telnet , if it connects then it shows below:

$telnet 10.238.136.165 9999 Trying 10.238.136.165... Connected to 10.238.136.165. Escape character is '^]'. Connection closed by foreign host.

If port is not available (either because someone else is already connected to it or the port is not open etc) then it shows something like it shows like below:

$telnet 10.238.136.165 9999 Trying 10.238.136.165... telnet: connect to address 10.238.136.165: Connection refused telnet: Unable to connect to remote host

So I think one needs to see whether:

• the application is property listening to port or not

• or someone else has already connected to it

Also try to connect on that m/c itself first like $telnet localhost 9999