This article was previously published under Q192749
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A failure to initialize the security subsystem can occur when anapplication such as Microsoft Exchange Server attempts to replicate dataover an SSL connection.
Schannel.dll can generate an error when two threads callAcquireCredentialsHandle() at the same time, with the same certificatedata.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
NOTE: Depending on whether you are using 40-bit or 128-bit security, one ofthe two files listed for each platform will be renamed to Schannel.dll.
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.