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EventID: 1309
Source: MSExchangeDS
Description:
Register LDAP SSL protocol failed with error 10049. The LDAP SSL server is not available. Make sure port number 636 is not used by another application.

EventID: 11508
Source: MSExchange POP3
Description:
Accept clients on POP3 interface failed in function HrRegisterProtocol with error 0×2741.

EventID: 1194
Source: MSExchangeIS
Description:
Accept client on external interface POP3 failed with error 0×80004005.

EventID: 11506
Source: MSExchange IMAP4
Description:
Accept clients on IMAP4 interface failed in function HrRegisterProtocol with error 0×2741.

EventID: 1194
Source: MSExchangeIS
Description:
Accept client on external interface IMAP4 failed with error 0×80004005.

EventID: 1194

Source: MSExchangeIS

Description:

Accept client on external interface NNTP failed with error 0×80004005

Read More:
Exchange Protocols Fail After Applying Windows NT 4.0 SP4