问题
I have setup eclipse to attach to a local JVM. But when I try to do the same for a machine over the network I get "connection timed out exception".
How do I go about debugging this issue?
I tried:
lsof -i :8787 on the remote machine, and it appears that a java process is in fact listening on that port.
What else could be wrong and how to go about finding it. Please help.
Thank you.
Note: My JAVA_OPT looks like this on the remote machine. JAVA_OPTS=”-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n $JAVA_OPTS”
回答1:
Servers often have multiple NICs; you might add the hostname or IP of the remote interface you're using to your debugging options, like so: -Xrunjdwp:transport=dt_socket,address=HOSTNAME_OR_IP:8787,server=y,suspend=n
回答2:
You should have a look at the TCP traffic with a program like tcpdump. Perhaps it's some naming problem in DNS?
回答3:
Sounds like a firewall or routing issue. Try using telnet (or something similar) to try and open a connection to that port. If that times out, then you have a networking problem, not a programming one.
来源：https://stackoverflow.com/questions/1916709/how-to-debug-a-connection-failure-between-jboss-and-eclipse-debugger