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sorry for late reply.
all network access to the controller is logged, so you can check if someone is trying to hack into the controller. So if someone is continuously attempting to log in, it may fill up the log file. You can add the ip address to your router's firewall blacklist.
the arduino ethernet shield can handle 4 connections at a time. If it gets overloaded, you may need to wait for connections to be timed out (I think 3 minutes), and try again.
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