Re: ssh MAC error

[Seth Arnold <sarnold@willamette.edu>]

* Meder Kydyraliev <meder100@mail.auk.kg> [010131 05:13]:
> I am trying to ssh to one host and i get this messages:
> 
> warning: Authentication failed.
> Disconnected; MAC error (Message authentication check fails.).
> 
> what is the  problem
> 

Meder, if this happens once, I wouldn't worry too much about it, unless
you are in a business where you *should* worry about it. (If that were
the case, you would probably know. :)

If this happens all the time when connecting to a specific machine, it
is possible that there is some errors in ssh -- someone else recently
was having trouble using the rijndael algorithm to connect between two
boxes with different byte ordering. You may be noticing something
similar. So, make sure you are using the newest ssh software on both
machines.

The MAC is a message authentication code -- it is a way of making sure
what goes in at one end is what comes out at the other end, unmolested.
It is sort of like a checksum, one that is one drugs, and keyed with a
password.

Running ssh in debug mode may give you more insight.

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