Error while step-by-step debugging

Hello,
This problem happens to me quite often, but not everytime.
On Windows XP, SP2, I develop an application which is deployed onto a JBoss 4 server through IDEA IntelliJ 7.
I launch my server through IntelliJ too, using the jrockit-R27.4.0 - 1.6.0 VM.
The application is a web based application using Wicket.
When I attempt to do step-by-step debugging, quite often, the stepping is very very slow. Then, after usually 2 steps, I receive this message:
ERROR: transport error 202: connect failed: Connection refused
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
The application has requested the JVM to exit with an fatal error from JNI. Error message:
JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)After which, I cannot use this server anymore, I have to kill it and restart it (which annoys me, as I chose JRockit to avoid the PermGen errors that the Sun VM had when redeploying 2 or 3 times the application on the JBoss server)
Any idea what this is due to? Or how I could solve it?

I'll try to reproduce the issue with a small java app instead of JBoss.
From the environment point of view:
IntelliJ 7.0.2 (build 7549)
Compiler: Sun Javac for JDK1.5.0.12
OS: Win XP, SP 2
IJ connects to the VM using socket (but errors also happened with Shared Memory connection, although the error message was different)
cmd /c "C:\Program Files\jboss-4.2.1.GA\bin\run.bat" -c default
===============================================================================
JBoss Bootstrap Environment
JBOSS_HOME: C:\Program Files\jboss-4.2.1.GA
JAVA: C:\Program Files\Java\jrockit-R27.4.0-jdk1.6.0_02\bin\java
JAVA_OPTS: -Xdebug -Xrunjdwp:transport=dt_socket,address=127.0.0.1:2106,suspend=y,server=n -Dprogram.name=run.bat -Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000
CLASSPATH: C:\Program Files\Java\jrockit-R27.4.0-jdk1.6.0_02\lib\tools.jar;C:\Program Files\jboss-4.2.1.GA\bin\run.jar
===============================================================================--
Edited by FDonckels at 11/29/2007 5:09 AM

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