Howdy,
this is a short write up about the Maintenance Operation Protocol (MOP), an ancient remote management protocol from the DECnet protocol suite. It’s old, rarely used and in most cases not needed at all. But as we stumbled across this protocol in some network assessments, it seems like a lot of network admins and other users don’t know about it. Even various hardening guides we’ve seen don’t mention MOP at all.
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