id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11964	asio async_resolve cannot be cancelled	sven_nilsson@…	chris_kohlhoff	"The asio '''async_resolve''' (both the udp and tcp resolver) is incorrectly implemented (on win32) as a '''synchronous resolve''' performed in a thread.

This has the unfortunate effect that, when the DNS server is not responding, the application will hang for ~20 seconds. The DNS operation is ongoing in the io_service, and thus the io_service destructor must wait for the thread to finish. I tried several methods in an effort to cancel it, but none worked.

Since the average user has approximately 5 seconds of patience with a non-responding application before killing it with task manager, I really think this needs to be fixed."	Bugs	new	To Be Determined	asio	Boost 1.59.0	Problem		asio asynchronous DNS resolve