Cannot connect through socket for client/server program?

It might help, at this point at least, if you were to printStackTrace on some of those exceptions you're discarding. I know on my personal development box I'm usually running at least 1 app server on a port like 8080, and I've got either Apache or IIS usually running on port 80, so if something else is already bound on the port so an exception will be thrown and caught by that first catch(exception e). You might be exiting the app before you close executes as well, as I think, the Javadoc says the call does not return, so while that probably isn't a problem, since you're tossing threads out you might have your own threads out there blocking other connections, though I really doubt that, it probably is one of those "behavior determined by the implementer" types of things.

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