Hello, I am fairly new to JBOSS but I got it up and running. I am running JBOSS 5.0.1 on Windows Server 2003 32Bit. I cahnged the line in the run.bat to the following: set JAVA_OPTS=%JAVA_OPTS% -Xms512m -Xmx1024m -XX:MaxPermSize=512m But when I change the -Xmx1024m to for example 2048 then the service does not want to start anymore. The eventlog does not really show any error. Why can't I run the service with 2048 for example. We have currently tomcat 6.0 in production and there I can run the service with 1536MB. So I also changed the setting for the JBOSS service as well to 1536MB but it still fails to start. I googeled the issue but I was not able to find an answer. Thank you for you help Marcus View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224083#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...