test when my firewall blocks my application

[Anddos]

i am trying to figure out what todo if i allow my app access the net and let the socket connect
then about 10 mins later ,, block it with my firewall ,
i want something to report that its been blocked instantly after i block it
it must be some condtion with the socket i think
anyone know how?

[Devil Panther]

As far as I noticed, you will get an error from the socket functions. For example, the send() will return a -1.
I don't think the program is capable of identifying a FW block. Think about it, for the application it's the same if the connection fails or the connection is blocked, the result is the same.