> Back to implementation, is there a way to do these steps:
> 1. Periodically check the state of TWSocket
> 2. If it is not listening, put it to listen again
> 3. If no response from TWSocket, destroy it and create a new 
> instance

There is no reason for a socket to stop listening.  I've got an ICS V5
application running on three servers and accepting an average of one
connection a second, that runs for several months between restarts. 

I have another application where sometimes Windows does get confused and
TCP/IP stops behaving correctly, and only a restart of the application,
or sometimes a PC reboot will fix it.

So I'd suggest your monitoring service itself tries to connect to your
listening socket once a minute sending dummy data, and then goes into a
cycle of restarting the service or rebooting the server if there is no
response over various intervals, I use five minutes for a restart, 30
minutes for a reboot (after six restarts).  

Also, the main application could send a windows message to the monitoring
application every time a socket connects, and you can then restart the
application faster if you expecting a certain level of connections each

I really would not bother about more debugging code, it's unlikely to be
an ICS problem, more likely a Windows update has corrupted something in

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