>>>>> On Mon, 20 Sep 2004 15:55:57 -0700 (PDT), Latha Krishnamurthi <[EMAIL 
>>>>> PROTECTED]> said:

Latha> I have declared 2 users in the snmpd.conf file as rwuser. I
Latha> have given the create user directive for the first user. I have
Latha> enabled both authentication and encrypton. Started the master
Latha> agent. During runtime I create the second user by cloning from
Latha> the first user, change the keys for him and delete the first
Latha> user from whom I cloned. I do all this using snmpusm. I keep
Latha> changing the keys for the second user once in a while by
Latha> executing snmpusm from a process. I supply the old key pair and
Latha> the new key pair to snmpusm. In one such instance (after some
Latha> successfull attempts), the master agent returns an
Latha> authentication failure for both the authentication key and the
Latha> encryption key. My feeling is that somehow the keys in my
Latha> memory and the master agent's memory are gone out of sync. I am
Latha> not sure why this happened. Is there a work around for this
Latha> without restarting the master agent. Is there any snmpusm
Latha> option with which I can reset the keys to some known value and
Latha> then change them to what I want ??

I'm not sure from your description what might have gone wrong.  It is
important that you don't mistype the old or new passwords, as even if
you do the keychange operation will happen and the keys will be
changed (and if you mistype the old password, it'll change the key to
something that you won't be able to recover from).  Also, make sure
that you shutdown the agent properly with a normal kill -TERM.  If you
had done a kill -9 it wouldn't have saved the user data and thus the
user will likely still have an old password in the persistent storage.

Options:

1) delete the user and recreate it cloning from something else again.
2) If you are running a 5.2 candidate (cvs or .pre1), it can support
   the diffie-helman MIB which allows you to negotiate a key between
   the snmpusm and the agent but it won't be based on a password
   (it'll look random).

-- 
Wes Hardaker
Sparta


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