Well, the updated server doesn't change a thing. The same thing again - it allows to make just a few queries and then refuses to accept messages ("failed to deliver message").
java -jar jbossesb-rosetta.jar yields 4.4GA :)
If that error message is what I suspect it is then it means that you are executing a synchronous delivery and that it has not received a response within the timeout.
What timeout are you using? What is happening on the server?
Also, what is the client environment?
OK, sorry I haven't been posting for some time. The issue seems to be resolved, there were several problems on the server side. Among them: missing libraries (quartz, antlr etc.), unnecessary tags in jboss-esb.xml, outdated juddi.properties, jndi.properties etc. :)
Well, that's all, thank you all for suggestions and advices. :)