thank you for your reply jaikiran.
The clients of my SLSB is other SLSB's and their client are simple servlets from another jboss as.
I think that problem is into HTTP server which clients are my SLSB's.
Problem are appearing at night, when requests achieve 100-150 per second.
It's clear everything with StrictMaxPool, but if I set limit on it, I'll get blocked requests.
It'll not resolve my problem, I think i must look into the http server.
Anyway, Thank you very much.
your reply was helpfull.