Arno Garrels wrote:
> So multiple calls to DnsLookup from the same thread context are
> serialized.

In other words, DnsLookup always returns immediately, however
Win32 API WSAAsyncGetHostByName serializes multiple requests from
the same thread context internally. 
This may trigger OnDnsLookupDone delayed but does not block a

A workaround was to write your own name resolution that uses 
multiple threads.

Arno Garrels   
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