Hi ktor's, after starting up de server, I produce single client calls to see the debug output I've noticed that the part corresponding to coroutines looks like: DEBUG [eventLoopGroupProxy-4-5 @call-handler#15], at every call the eventLoopGroupProxy is increased by one 4-1,4-2,4-3 ....I think the first 4 corresponds to number of threads in the pool, and second to number of current call. The second part the @call-handler is increased by 3 ie 3,9,12... but I cannot guess it's meaning and I fear I'm not closing resources. I'm I right in my suppositions? thanks a lot