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Cisco Bug: CSCup94684 - LSC phone certificates does not contain AIA, CDP and SAN attributes

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Unified PhoneProxy

Known Affected Releases


Description (partial)

LSC phone certificates does not contain two attributes:

1)      There is no CDP extension (CRL distribution point)
2)      There is no AIA extension (Authority Information Access)

Where as MIC contains the above attributes.

As per Microsoft, they also need a subject alternative name in LSC.

These 2 attributes are required for ip phone LSC if we use Mircosoft NPS server. Because of this attributes are missing, ip phone with a 802.1x enabled port may not register with CUCM. Microsoft NPS will reject this request.

NPS might give the following error:

(Reason code 293):

Authentication failed. The certificate provided by the connecting user or computer is not valid because it is not configured with the Client Authentication purpose in Application Policies or Enhanced Key Usage (EKU) extensions. NPS rejected the connection request for this reason.
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