Error: MS CA error 0xc80005e2 while enrolling


Microsoft Certificate Authority (CA) certificate enrollment fails at stage 500 with error 0xc80005e2.


This error is caused by having too many Subject Alternate Names (SAN) in the certificate request. There is no specific limit on the number of SANs for a certificate issued by MS CA. The total size of SANs is limited to 4KB.


Ensure the certificate object does not have SANs that exceed the length of 4KB. For example, 151 25-character DNS name entries, plus the overhead for encoding (~2 bytes per name), comes in at 4,081 bytes, just under the 4KB limit. More info can be found in this Microsoft TechNet article.

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