It's been a while since I've done much work at this layer but it looks as though you are running a single threaded server listener and so you must wait for the TIMEOUT release by the server. This is an important necessary requirement - you do not want another client to connect to your TCP connection and you do not want to lose the connection if it is interrupted for a minute. I may not be explaining this very well but is worth reading more on single and multi-threaded TCP servers.

A good place to start off the top of my search is this SO article. or some of the older PM nodes such as 549414

In reply to Re: IO::Socket persisting on Linux despite being closed (updated) by localshop
in thread IO::Socket persisting on Linux despite being closed (updated) by davies

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