Event ID 5783 System Log of an 2008 R2 Application Server and Event ID 5783 on 2003 Domain Controller

Not sure why this is happening, domain controller DC07 is working ok and so is the DC05 that DC07 is calling. Can someone please shed some light?

If this would help, the only difference I made on these domain controllers since these errors were there are scheduled system state backups on these DCs using ntbackup.exe. Not sure if that is relational. Also, as an FYI ---

DC05 is a global catalog 2003 server
DC07 is not a global catalog 2003 server
appserver01 = 2008 R2

Thank you...


System error on 2008 R2 Application Server:
Log Name:      System
Source:        NETLOGON
Date:          6/23/2011 4:15:05 AM
Event ID:      5783
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Appserver01.domain.com
Description:
The session setup to the Windows NT or Windows 2000 Domain Controller \\dc07.domain.com for the domain <DOMAINNAME> is not responsive.  The current RPC call from Netlogon on \\Appserver01.domain.com to \\dc07.domain.com has been cancelled.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="NETLOGON" />
    <EventID Qualifiers="0">5783</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-06-23T08:15:05.000000000Z" />
    <EventRecordID>13582</EventRecordID>
    <Channel>System</Channel>
    <Computer>Appserver01.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>\\dc07.domain.com</Data>
    <Data>DOMAIN</Data>
    <Data>Appserver01</Data>
  </EventData>
</Event>

Error in Domain Controller dc07.domain.com
Event Type:      Warning
Event Source:      NTDS General
Event Category:      Global Catalog
Event ID:      1655
Date:            6/22/2011
Time:            4:00:26 AM
User:            NT AUTHORITY\ANONYMOUS LOGON
Computer:      DC07
Description:
Active Directory attempted to communicate with the following global catalog and the attempts were unsuccessful.
 
Global catalog:
\\dc05.domain.com
 
The operation in progress might be unable to continue. Active Directory will use the domain controller locator to try to find an available global catalog server.
 
Additional Data
Error value:
1727 The remote procedure call failed and did not execute.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.