I never had this issue longer than 10 minutes so I can't say...
But I don't think it's caused by your hacks. It rather would be some problem with your connection
found this in PortForward.com
Quote:
Diablo II:
Allow port 6112 TCP out and allow established sessions in
Allow port 4000 TCP out (realm games)
Allow port 4000 TCP out and in (hosting open games only)
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Try to forward them, it may work.
Good luck