slow ssh login behind router

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I am new to ssh and got the damon to work, so I can log in from outside a
local network into the server behind a hardware router. In the beginning
the login was fast, but now it becomes slower and slower. I have read,
that this may be caused by the 'reverse DNS lookup'. But after hours of
studies of what I have found with google, I still do not understand. I
have deactivated reverse mapping by 'VerifyReverseMapping no' being
uncommented. But without success. There is no failure message in

Is there anyone, that can help me.



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