Good point. I found also no real solution yet, I use a IP-only policy in my inner network core. Only the (user) interface deals with hostnames, e.g when a) connecting to new servents and host caches or b) when displaying connected hosts. At the moment I see no way arround another worker thread which the single purpose of resolving hostnames to IPs.
Perhaps this is again a topic for design review of CAsyncSocket. The problem is especially Connect() which does a 'lphost = gethostbyname(lpszAscii)', which can block for seconds or minutes when calling with a host name.

Greets, Moak