Seems like your "upgradation" resulted in a "degradation"... [=`)
Seriously, this does not appear to be a "network" problem. Especially since
it does not seem that the "network" has been changed (I am assuming that the
"upgradation" of the AS400 iincluded only software).
The network appears to be functioning, in that the request from the NT
server for a TCP session is reaching the AS400. The fact that it is being
met with a RST is another matter altogether.
In fact, that is where I would begin. What are the criteria required for the
NT servers to successfully establish a session with the AS400? Do they
include specific addresses (IP, or MAC), authentication issues, etc? An RST
(reset) message from the AS400 is essentially equivalent to the AS400
hanging up the phone...
What are the time deltas between the SYN and the RST? If you attempt to
connect a number of times in a row, are the deltas consistent? Do pings
display the same sorts of delta's? What are the characteristics of those
servers that DO connect and how do they differ from those that cannot?
I have asked a number of questions here - please DO NOT send me the answers.
I simply want to point you toward some things to think about. Bottom line -
there are a number of criteria for establishing a connection to the AS400,
and those criteria are no longer being met. Determine what those criteria
are and which ones are not met, then deterimine why not. This will lead you
to the solution.
Good luck!
Z
PS - I hope this isn't my bank...
>From: Andrew Larkins <[EMAIL PROTECTED]>
>Reply-To: Andrew Larkins <[EMAIL PROTECTED]>
>To: Gayathri <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>Subject: RE: Please help - this is quiet urgent
>Date: Tue, 27 Mar 2001 15:12:57 +0200
>
>what kind of upgrade was done on the AS400??.
>How does the AS400 connect to the network?? STUN, DLSW????
>
>-----Original Message-----
>From: Gayathri [mailto:[EMAIL PROTECTED]]
>Sent: 27 March 2001 14:41
>To: [EMAIL PROTECTED]
>Subject: Please help - this is quiet urgent
>
>Hello
>
>I have a strange problem here. WE upgraded our AS400 system. The AS 400 is
>equipped with a fddi card and a fast ethernet card both on 2 different
>vlans.
>
>When I try to connect from my NT server to the AS400 the session keeps
>timing out. This problem occured only after the upgradation.
>
>out of 34 branches ( this is a banking environment) only 3 servers can
>connect.
>
>When i try to sniff at the nt server, the output shows that there is a SYN
>from the nt server and RST from AS400.
>
>IBM guys are here, but we dont seem to get across a solution.
>
>The NT server are running service pack 3.
>
>Is this related to any session time out ??
>
>If anybody has come across a similar problem please share your ideas. CAnt
>seem to decide whether at all this is a network problem
>
>
>Thanks
>
>
>
>
>
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