I'm running Win NT, JBoss2.4.3Tomcat3.2.3 and I'm using stateful EJBs. My application does some cyclic calculation. After a few more than 400 calculations (10 minutes) it just decides to stop instead of calculating some thousand more. No mattering where I step into the application the behavior does not change. I think, the Server is responsible. I checked the configuration, all age-limits have been set to a value of 600000/1800000, the maxnumbers of allowed beans whatever has been set to 1000 instead of 100. Nothing changes. I don't have an idea anymore why the application stops... it just hangs up without an error in the log.