This issue is driving me up the wall and Microsoft has yet to get back to me with anything.
I'm running a basic network of 12 servers (all HP DL380's running Windows Server 2003 Enterprise) and 80 workstations (all HP d530's running Windows XP Pro SP2). Workstations are on a different segment than Servers. I'm running Active Directory and my domain controller runs this along with DHCP and DNS.
My problem is that sporadically, a client will (all of a sudden) not be able to access Exchange, or File Services, or the Intranet site. Sometimes all of these are unavailable, sometimes it's just one or two of these that are unavailable. When performing an NSLookup on the resource, it's found easily but still, the resource itself cannot be accessed. If I do an IPCONFIG /FLUSHDNS and then an IPCONFIG /REGISTERDNS a few times, all of a sudden, the problem is fixed and all is well for a while, sometimes the rest of the day. I should also note, that it's only internal resources that cannot be accessed. All external resources are fine, and never fail during this period. Also, it's not ALL clients that have problems. It's just a few out of the computers at any given time, and it's not consistently the same ones that are problematic. It rotates around randomly.
My DNS looks ok. Microsoft has checked it out and it seems there are no flaws or problems with it. I run a basic internal zone, forwarding out to my internet provider for non-internal queries. I have turned scavenging off (since the problem started) thinking it was to blame, but it's off and hasn't made a difference.
Any thoughts? I'm going nuts here and have run out of ideas..