exchange 2007 event id 2501 2152 2604 1121

My mail server hangs at applying computer settings.  I used another server to access the event log and found these event id's 2501 2152 2604 1121.  Checked my service and found my IS stopping, SA starting, and POP3 stopping. I've been at this for about 4-5 hours now.

Event Type:      Error
Event Source:      MSExchange ADAccess
Event Category:      General
Event ID:      2501
Date:            10/1/2009
Time:            4:06:40 PM
User:            N/A
Computer:      MAIL07
Description:
Process MSEXCHANGEADTOPOLOGY (PID=1504). The site monitor API was unable to verify the site name for this Exchange computer - Call=HrSearch Error code=80040a01. Make sure that Exchange server is correctly registered on the DNS server.

Event Type:      Error
Event Source:      MSExchange ADAccess
Event Category:      General
Event ID:      2152
Date:            10/1/2009
Time:            4:06:56 PM
User:            N/A
Computer:      MAIL07
Description:
Process w3wp.exe (EWS) (PID=2512). An remote procedure call (RPC) request to the Microsoft Exchange Active Directory Topology service failed with error 1753 (Error 6d9 from HrGetServersForRole). Make sure that the Remote Procedure Call (RPC) service is running. In addition, make sure that the network ports that are used by RPC are not blocked by a firewall.

Event Type:      Error
Event Source:      MSExchange ADAccess
Event Category:      General
Event ID:      2604
Date:            10/1/2009
Time:            4:07:39 PM
User:            N/A
Computer:      MAIL07
Description:
Process MSEXCHANGEADTOPOLOGY (PID=1504). When updating security for a remote procedure call (RPC) access for the Exchange Active Directory Topology service, Exchange could not retrieve the security descriptor for Exchange server object MAIL07 - Error code=80040a01.
 The Exchange Active Directory Topology service will continue with limited permissions.

Event Type:      Error
Event Source:      MSExchangeIS
Event Category:      General
Event ID:      1121
Date:            10/1/2009
Time:            4:07:42 PM
User:            N/A
Computer:      MAIL07
Description:
Error 0x96f connecting to the Microsoft Active Directory.  

Event Type:      Error
Event Source:      MSExchangeIS
Event Category:      General
Event ID:      5000
Date:            10/1/2009
Time:            4:07:42 PM
User:            N/A
Computer:      MAIL07
Description:
Unable to initialize the Microsoft Exchange Information Store service.   - Error 0x96f.  

Event Type:      Error
Event Source:      MSExchange ADAccess
Event Category:      Topology
Event ID:      2114
Date:            10/1/2009
Time:            4:07:57 PM
User:            N/A
Computer:      MAIL07
Description:
Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1504). 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.