Article ID: 214864 - View products that this article applies to.
This article was previously published under Q214864
After you apply Windows NT 4.0 Service Pack 4, Microsoft Exchange Internet Applications and Services may no longer function properly and the following errors are visible in the Event Viewer:
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.
Source: MSExchange POP3
Accept clients on POP3 interface failed in function HrRegisterProtocol with error 0x2741.
Accept client on external interface POP3 failed with error 0x80004005.
Source: MSExchange IMAP4
Accept clients on IMAP4 interface failed in function HrRegisterProtocol with error 0x2741.
Accept client on external interface IMAP4 failed with error 0x80004005.
Accept client on external interface NNTP failed with error 0x80004005
Windows NT 4.0 Service Pack 4 causes NDISWAN Services to return IP addresses in the order in which they are bound. This change results in IP addresses not currently bound to the TCP/IP stack being returned when making a call to the Winsock API function GetHostbyName(). Microsoft Exchange Server fails to register Internet protocols with these IP addresses.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMSThis hotfix has been posted to the following Internet location as Rnr-fixi.exe (x86) and Rnr-fixa.exe (Alpha):
Microsoft has confirmed that this is a problem in Windows NT 4.0 Service Pack 4. This problem was first corrected in Windows NT version 4.0 Service Pack 5.
NNTP is another protocol that Exchange supports and this error can occur with this protocol for the same reasons.
This error can also occur when certain applications are installed that overwrite the files:
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