AD errors

We are on a Windows Server 2003 PDC and I am getting errors in the directory service log which is written below:

Event Type: Information
Event Source: NTDS LDAP
Event Category: LDAP Interface
Event ID: 1535
Date: 20.3.2007
Time: 22:10:55
User: mydomain\username
Computer: SERVER-AD
Description:
Internal event: The LDAP server returned an error.

Additional Data
Error value: 0000208D: NameErr: DSID-031001CD, problem 2001 (NO_OBJECT), data 0, best match of: 'CN=User,CN={6297A01D-A37C-4D41-BE4A-DDA84F579F19},CN=Policies,CN=System,DC=mydomain,DC=local'

Usually followed by:
Event Type: Information
Event Source: NTDS LDAP
Event Category: LDAP Interface
Event ID: 1535
Date: 20.3.2007
Time: 22:32:38
User: mydomain\username
Computer: SERVER-AD
Description:
Internal event: The LDAP server returned an error.

Additional Data
Error value: 00002071: UpdErr: DSID-030502F7, problem 6005 (ENTRY_EXISTS), data 0

Event Type: Information
Event Source: NTDS LDAP
Event Category: LDAP Interface
Event ID: 1317
Date: 20.3.2007
Time: 22:38:57
User: N/A
Computer: SERVER-AD
Description:
Internal event: The local domain controller has disconnected the LDAP connection from the following network address due to a time-out.

The error seems to be relating to LDAP. Have you done any external connections doing LDAP calls? You can even try to run diagnostics against your Active Directory domain and see if that works. Incase the tools are not installed, then install them from your server install disk. After that run dcdiag, netdiag and repadmin in verbose mode like the below:

• DCDIAG /V /C /D /E /s:yourdcname > c:\dcdiag.log
• netdiag.exe /v > c:\netdiag.log (On each dc)
• repadmin.exe /showrepl dc* /verbose /all /intersite > c:\repl.txt

Hi there, I am getting this error message when typing rendom /list:
ldap_search_sW for rid fsmo dns name failed on cipres.adm.cuna.ac.cr.
0000208D: NameErr: DSID-031001CD, problem 2001 (NO_OBJECT), data 0, best match of:
'CN=Servers,CN=Default-First-Site,CN=Sites,CN=Configuration,DC=adm,DC=cu
na,DC=ac,DC=cr'
: Win32 Error 2 :2

I can ping the server cipres.adm.cuna.ac.cr. What I am trying to do a rename domain using rendom. All the domain controllers are set to windows 2003 native functional level.
This cipres server is a BDC, before applying this command this command looked at the DC, and now the error is not showing to the DC, just to the BDC.
Is there anything I can do to solve this problem?