Outlook 98 Client cannot use NSPI Proxy

[beefstew]

We have 6 Exchange 2003 Clustered Servers and various MAPI clients connecting. 2 Of these Servers are not allowing Outlook 98 clients to connect to Mailboxes (Outlook 2000 Clients are OK as they obviously use the referral service instead of NSPI).

The Exchange Server is returning the error "The name could not be resolved. Network Problems are prenting connection to the Microsoft Exchange Server"

I have captured the data with Ethereal and am seeing the following:

DCERPC Bind_nak: call_id: 2 reason: Local Limit Exceeded

I then see a load of PING requests before the request times out.

I have have checked name resolution and all seems to be OK. I think it is something to do with DSProxy

Any info glady appreciated.
Thanks

 

[Zelandakh]

There's a setting that disables Outlook versions below a certain threshold - try that.

 

[xmsre]

There is no NSPI component in Exchange 2000 or 2003. Instead, DSProxy on the Exchange server proxies the calls to the Global catalog for clients prior to Outlook 2000.

http://support.microsoft.com/kb/256976/

To troubleshoot your problem with connectivity, Id follow

http://support.microsoft.com/kb/325930/en-us

It sounds very much like you're missing some registry entries.