IntelliJ Idea IDE using port 1099

I am sure IntelliJ Idea does not use 1099 port internally. I have used this PORT for Tomcat. I would suggest checking if any of idea plugins that you have installed are running on this port. Most of the operating systems can give you the application name that is running on that port.

Eg: lsof -w -n -i tcp:8080 would give me the application running on 8080 on my linux machine.

Hope this helps.

Go to terminal and kill the session

ps -aef | grep 1099
kill -9 PID