If you see the following error trying to do Active Directory LDAP queries using a secure connection (AuthenticationTypes.Secure):
Type : System.Runtime.InteropServices.COMException, mscorlib, Version=188.8.131.52, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : The server is not operational.
Source : System.DirectoryServices
ErrorCode : -2147016646
Check to make sure your domain certificate hasn’t expired.
You may also see the following event in System Event Log:
Event Type: Error
Event Source: Schannel
Event Category: None
Event ID: 36881
The certificate received from the remote server has expired. The SSL connection request has failed. The attached data contains the server certificate.
MS has a KB article on this issue: http://support.microsoft.com/kb/839514
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