Port 21 suddenly not responding

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PhilUp

I have a cloud server setup, running WS2012, been fine for years… suddenly in the last couple of days (after the last Windows Update, though whether that’s related or not IDK) all connections of port 21 are failing FTP or telnet…. If I re-boot the server, they work for 5 minutes or so, then fail again.

If I run

netstat –an

in a cmd window, I get the usual – but nothing registered for port 21 at all….

Has anyone got any ideas about this? Thanks....

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