ProxyServer its TcpConnectionFactory seems to not cleanup all connections

[faucetcollector]

Version: 3.1.1434-beta (also 3.1.1397)

After Stopping the proxy server and even disposing it I noticed there are still some sockets in CLOSE_WAIT that don't go away (not even after 4 minutes)

The number of open sockets matches the number of connections still referenced in the TcpConnectionFactory its disposalBag - even tho the TcpConnectionFactory is already disposed (disposed property equals true).
See this snapshot I took after stopping the ProxyServer:

Any clues why this is happening?

[faucetcollector]

The proxy is used by a browser. I noticed that I closed the proxy before terminating the browser - so it seems any requests that come in while the proxy is stopping are not always correctly cleaned up. Now that I'm first closing the browser and then shutting down the proxy the issue is resolved.