vSphere Client/vSphere Web Client fails to connect to vCenter Server and reports the error: Could not create SSL/TLS secure channel

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Symptoms:

The vSphere Client or vSphere Web Client fails to connect to vCenter Server.
You see the error:

vSphere Client could not connect to vCenter_Server_Name. An unknown connection error occurred. (The request failed due to an SSL error. (The request was aborted: Could not create SSL/TLS secure channel.))
In the vpxd.log file, you see entries similar to:

warning 'Libs'] SSLSystemVerifyDERCert: Failed to create a Win32 certificate context for the peer sertificate. LastError = -2146885630
warning 'Libs'] SSLSystemVerifyDERCert: Failed to create a Win32 certificate context for the peer sertificate. LastError = -2146885630
warning 'Libs'] SSLSystemVerifyDERCert: Failed to create a Win32 certificate context for the peer sertificate. LastError = -2146885630

Notes:
- For more infomation on log locations, see Location of vCenter Server log files 1021804).
- The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

This issue occurs if the SSL certificate was generated/installed on any of these dates:

This issue is resolved in vCenter Server 5.1.0a and later, available at VMware Downloads. For more information about this version, see the VMware vCenter Server 5.1.0a Release Notes.

To work around the issue when you are unable to upgrade, regenerate the SSL certificate for a date that is not in any of these 7 days.

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