Java remote debugging connection refused

Question

I get connection refused when remotely debugging a Java application that executes on a different server. The JVM is version 16, and the OS is Ubuntu 21.04. I chose 8999 as an unused port on the server. Not much help from Oracle documentation on runjdwp.

The command line options are ...

-Xdebug \
-Xrunjdwp:transport=dt_socket,address=8999,server=y,suspend=y \

Does this answer your question? Remote debugging: No connection to Wildfly 14 on OpenJDK 11 at port 8787 — tgdavies
– tgdavies, Commented Sep 21, 2021 at 21:08
Yes, the answer to your linked question also answers my question. The answer specifies *:<port> where I used IPv4 0.0.0.0:<port>. — Stephen Reed
– Stephen Reed, Commented Sep 22, 2021 at 23:59

Stephen Reed · Accepted Answer · 2021-09-21 20:42:06Z

8

The socket 8999 on the remote host defaults to 127.0.0.1:8999 which only accepts connections from running on the same host. In order to accept connections from any host, I found that the following worked OK.

-Xdebug \
-Xrunjdwp:transport=dt_socket,address=0.0.0.0:8999,server=y,suspend=y \

answered Sep 21, 2021 at 20:42

Stephen Reed

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1 Comment

Thorbjørn Ravn Andersen Over a year ago

Note that 0.0.0.0 is ip v4 Only.

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