IntelliJ listens on tcp and udp ports on address 0.0.0.0 - Why? Is it unsecure?

Answered
Avatar
Matthias Kurz
Created

netstat tells me that the java process IntelliJ runs with opens four ports (1 x tcp, 1 x tcp6, 2 udp) and listens on them on address 0.0.0.0...

Is this normal? I mean 0.0.0.0 opens them up for the whole world...

What are all of these 4 ports used for? Is it possible to bind them to 127.0.0.1 only?

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:38735           0.0.0.0:*               LISTEN      22246/java          
tcp6       0      0 :::41591                :::*                    LISTEN      22832/java          
udp        0      0 0.0.0.0:8976            0.0.0.0:*                           22246/java          
udp        0      0 0.0.0.0:47619           0.0.0.0:*                           22246/java

 

Votes

1

Share

4 comments
Avatar
Serge Baranov
Created

UDP port is used for the licensing check and is by design.

TCP port on 0.0.0.0 should not be open out of the box, what plug-ins do you have installed?

There is a known issue related to Scala plug-in:

https://youtrack.jetbrains.com/issue/IDEA-175889
https://stackoverflow.com/a/43368412/104891

Built-in web server set to accept external connection is another possible case: https://stackoverflow.com/a/45970512/104891.

0
Avatar
Matthias Kurz
Created

> UDP port is used for the licensing check and is by design.

Both UDP ports?

 

Yes, I do have the Scala Plugin installed...

 

And your link to IDEA-209726 is wrong I think (it's about keyboard shortcut problem).
I guess you mean IDEA-175889.

0
Avatar
Matthias Kurz
Created

I found out more: One of the two open TCP ports is the remote maven server... The other one I still don't know...

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:46373           0.0.0.0:*               LISTEN      27912/java          
tcp6       0      0 :::37283                :::*                    LISTEN      28193/java          
udp        0      0 0.0.0.0:8976            0.0.0.0:*                           27912/java          
udp        0      0 0.0.0.0:34305           0.0.0.0:*                           27912/java          

$ jps -l 
28193 org.jetbrains.idea.maven.server.RemoteMavenServer
27912 com.intellij.idea.Main
0
Avatar
Serge Baranov
Created

Sorry, clipboard glitch, fixed the comment. Might be also JDK specific issue, our developers are looking into it.

0

Please sign in to leave a comment.