DNS & AD releated errors on Web Server

I have 3 servers, a DC, backup DC (DC2), and a web server.  Both DC's run SQL, and the web server connects to both of these.  I am getting intermittent connectivity issues, and here are the errors from the event log on my web server.
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Windows cannot obtain the domain controller name for your computer network. (An unexpected network error occurred. ). Group Policy processing aborted.
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The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/dc2.ourdomain.com.  The target name used was MSSQLSvc/DC2.ourdomain.com:1433. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named  machine accounts in the target realm (OURDOMAIN.COM), and the client realm.   Please contact your system administrator.
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The system failed to register pointer (PTR) resource records (RRs) for network adapter
with settings:

   Adapter Name : {EDFB3AF6-1B19-46DF-9D14-0000000000000}
   Host Name : Web-Server
   Adapter-specific Domain Suffix : ourdomain.com
   DNS server list :
           192.168.10.1, 192.168.10.2
   Sent update to server : 198.6.100.21
   IP Address : 208.255.0.0 (IP of web server)

 The reason that the system could not register these RRs was because of a security related problem. The cause of this could be (a) your computer does not have permissions to register and update the specific DNS domain name set for this adapter, or (b) there might have been a problem negotiating valid credentials with the DNS server during the processing of the update request.

 You can manually retry DNS registration of the network adapter and its settings by typing "ipconfig /registerdns" at the command prompt. If problems still persist, contact your DNS server or network systems administrator.

I have no idea where to start.  Any help would be appreciated.  Also, all of the servers are running WS2003 with SQL 2000.