[AWS] problem using AWS in long term use

[Emmanuel Briot]

> When this behavious happen, there is no load on the server, and all the
> slots may be free for handling the request.

Any chance that your application raised exceptions that were not caught by 
your AWS callback, and thus resulted in killing the thread. As a result, 
there would be no available thread in AWS to accept your connection.

For information, we have several servers running for very long times with no 
problem at all (in particular libre.adacore.com), so there is no obvious 
problem in AWS, although there could of course be a bug triggered in some 
cases.

regards
Emmanuel