After starting tomcat with jpda on, while at my company I can remote debug a bunch of web applications in eclipse. For a number of reasons I am now in need of developing and remote debugging those same webapps from outside the company firewall, and i can only access that server via ssh on port 22.
I tunneled most needed ports (svn, nexus, tomcat itself, from the server or via the server) to localhost and those services work fine, but I cannot start the eclipse debugger in any way; i'm getting "connection timed out while waiting for packet XXX" or "connection refused" from the second time i try on. Checking with nmap on the server, it reports the port open before the first connection attempt, and it becomes closed after that. I get no interesting output log in catalina.out
The command i use to start the tunnel is:
ssh -L 8000:localhost:8000 user@mycompany.com
iptables was temporarily stopped both on the server and in the local machine for testing.
Am i missing something? Do I need to forward some other port to localhost? Or is it in some way involved name resolution?
EDIT
Open ports before connection attemp from eclipse:
root@lnxulisse:/opt/apache-tomcat-6.0.32/bin# lsof -p 2147 -n |grep TCP
java 2147 root 4u IPv4 640850 0t0 TCP *:8000 (LISTEN)
java 2147 root 38u IPv6 640859 0t0 TCP *:http-alt (LISTEN)
java 2147 root 40u IPv6 640865 0t0 TCP *:https (LISTEN)
java 2147 root 46u IPv6 640908 0t0 TCP 127.0.0.1:18005 (LISTEN)
java 2147 root 48r IPv6 642625 0t0 TCP 172.24.0.82:48347->172.24.0.82:mysql (ESTABLISHED)
java 2147 root 181u IPv6 640891 0t0 TCP 172.24.0.82:60353->172.24.0.82:mysql (ESTABLISHED)
and after:
java 2147 root 4u IPv6 642769 0t0 TCP 172.24.0.82:48956->172.24.0.82:mysql (ESTABLISHED)
java 2147 root 5u IPv4 640851 0t0 TCP 127.0.0.1:8000->127.0.0.1:34193 (ESTABLISHED)
java 2147 root 38u IPv6 640859 0t0 TCP *:http-alt (LISTEN)
java 2147 root 40u IPv6 640865 0t0 TCP *:https (LISTEN)
java 2147 root 46u IPv6 640908 0t0 TCP 127.0.0.1:18005 (LISTEN)
java 2147 root 181u IPv6 640891 0t0 TCP 172.24.0.82:60353->172.24.0.82:mysql (ESTABLISHED)
exact eclipse error returned is:
Exception occurred during launch
Failed to connect to remote JVM. Connection timed out.
Timeout occurred while waiting for packet 204.
(the packet number varies on each attempt).
in workspace/.metadata/.log i get:
!ENTRY org.eclipse.osgi 2 0 2011-07-17 18:43:53.024
!MESSAGE While loading class "org.eclipse.core.net.proxy.IProxyService", thread "Thread[main,6,main]" timed out waiting (5000ms) for thread "Thread[Thread-6,5,main]" to finish starting bundle "org.eclipse.core.net_1.2.1.r35x_20090812-1200 [232]". To avoid deadlock, thread "Thread[main,6,main]" is proceeding but "org.eclipse.core.net.proxy.IProxyService" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: State change in progress for bundle "reference:file:plugins/org.eclipse.core.net_1.2.1.r35x_20090812-1200.jar" by thread "Thread-6".
at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1073)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:278)
[...]
!ENTRY org.eclipse.ui.ide 4 4 2011-07-17 18:43:53.028
!MESSAGE Proxy service could not be found.
eclipse is configured for direct internet connection.
EDIT 2
I think the solution might be here:
http://blog.cantremember.com/debugging-with-jconsole-jmx-ssh-tunnels/
but i have some trouble understanding his JNDI/RMI settings, and to what extent that applies to my configuration.
EDIT 3
This is a clarification for those answering "use <lan|local ip address> instead of <localhost>"
- computer A: my workstation in the company
- computer B: my workstation at home
- computer C: server running tomcat
B and C are in two different sub-networks in the same network infrastructure; only connections to port 22 of C from outside are allowed (and somewhat "proxied", I don't know network internals).
A is "outside" (my dsl connection with dynamic ip address).
Debugging on C from B via ssh tunnel -> works
Debugging on C from A via ssh tunnel -> connection timed out while waiting for packet XXX