Hi Ron, Thanks for your response. When the clientMaxPoolSize=MaxPoolSize=100, all the 300 client threads works fine - only for the threads that don't reach numberOfRetries=30 (corresponding to a time of 30 seconds). Ok, there is sense to have clientMaxPoolSize<=maxpoolSize. But in this case I should expect that the backlog queue don't be used. So I wonder about the responsability of backlog queue. In what situation is it used ? PS : concerning my tests whith the 1.4.3 version of Remoting, I believe that the clientMaxPoolSize didn't works (contrary to the 2.2.2 version). I had observed that the first 400 serverThreads had been created simultanously although the clientMaxPoolSize=50. It is not a problem for me because I'm using the 2.2.2 version. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4131384#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...