security log errors



My windows 2000 domain controllers recently started generating alot of
675 errors - coming from exchange 2000 mail servers (running on windows 2000
servers or domain controllers - Active directory is 2000 mixed mode) as well
as windows 2000 pro client machines :

Pre-authentication failed:
User Name: server$
User ID: domain\server$
Service Name: krbtgt/domain
Pre-Authentication Type: 0x2
Failure Code: 0x18
Client Address:

Recent environment changes include:

switching exchange 2000 to native mode (last 5.5 server removed long ago but
only switched modes recently)

addition of 1st exchange 2003 server on windows 2003 server (ran domain &
forest prep as part of that - netdiag & dcdiag also ran clean )

enabled scavenging of stale dns records

additionally I get the following errors:

event id 565
category : directory services access
type: failure

Object Open:
Object Server: DS
Object Type: dnsNode
Name: DC=6,,CN=MicrosoftDNS,CN=System,DC=my,DC=domain
New Handle ID: -
Operation ID: {0,411228257}
Process ID: 268
Primary User Name: domaincontroller$
Primary Domain: mydomain
Primary Logon ID: (0x0,0x3E7)
Client User Name: exch2kserver$
Client Domain: mydomain
Client Logon ID: (0x0,0x1882D852)
Accesses Write Self

Privileges -

Write Property

Any ideas why would be appreciated - I am posting in exch 2000 newsgroup also

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