How do I fix an Exchange 2007 Topology discovery failure error 0x80040a02 (DSC_E_NO_SUITABLE_CDC)?

When I start the Exchange 2007 Active Directory Topology Service, I get the following three events in my Application Event Log:
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ERROR      10/19/2009 2:09:25 PM      MSExchange ADAccess      2114      Topology      
"Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=4948). Topology discovery failed, error 0x80040a02 (DSC_E_NO_SUITABLE_CDC). Look up the Lightweight Directory Access Protocol (LDAP) error code specified in the event description. To do this, use Microsoft Knowledge Base article 218185, ""Microsoft LDAP Error Codes."" Use the information in that article to learn more about the cause and resolution to this error. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers."

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INFORMATION      10/19/2009 2:09:25 PM      MSExchange ADAccess      2080      Topology      
"Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=4948). Exchange Active Directory Provider has discovered the following servers with the following characteristics:
 (Server name | Roles | Enabled | Reachability | Synchronized | GC capable | PDC | SACL right | Critical Data | Netlogon | OS Version)
In-site:
dc1.MYDOMAON.local      CDG 1 0 0 1 0 0 0 0 0
Out-of-site:

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INFORMATION      10/19/2009 2:09:25 PM      MSExchange ADAccess      2081      Topology      
"Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=4948). Exchange Active Directory Provider will use the servers from the following list:
Domain Controllers:
 
Global Catalogs:
 
The Configuration Domain Controller is set to <None>.  "
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The Question: https://www.experts-exchange.com/questions/23048451/Exchange-2007-The-Exchange-topology-service-did-not-return-a-suitable-domain-controller.html discusses this issue, but the answer provided eludes me. I checked all my DNS entries and they appear to be correct (including the RDNS PTR entry). However, the solution says that "a good DSAccess should look like: server1.domain.com      CDG 1 7 7 1 0 1 1 7 1".  How do I get my server to look like this?

ntdsutil reports for select operation target: list roles for connected server:
 Server "dc1" knows about 5 roles:
  Schema - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MYDOMAIN,DC=local
  Naming Master - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MYDOMAIN,DC=local
  PDC - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MYDOMAIN,DC=local
  RID - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MYDOMAIN,DC=local
  Infrastructure - CN=NTDS Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=MYDOMAIN,DC=local

I am running Windows 2003 Server as a single Domain Controller with Exchange Server 2007 on it as well. Yes, all on the same server. There is no separate Edge server or even a backup DC (at the moment). How do I fix this topology discovery error? (Step-by-step answers are very much appreciated!). Thanks in advance.