I did some checks on certificates and their AIA sections and noticed
that several Microsoft certificates were referencing intermediate
certificates in the "CA Issuer" field that give a 403 error.

http://www.microsoft.com/pki/mscorp/Microsoft%20IT%20TLS%20CA%201.crt
http://www.microsoft.com/pki/mscorp/Microsoft%20IT%20TLS%20CA%202.crt
http://www.microsoft.com/pki/mscorp/Microsoft%20IT%20TLS%20CA%204.crt
http://www.microsoft.com/pki/mscorp/Microsoft%20IT%20TLS%20CA%205.crt

These are listed in active use on certificates on public hosts
(e.g. azure.com, msn.com, skype.com, xbox.com).

I have informed Microsoft through the contact mail address in the CCADB.

-- 
Hanno Böck
https://hboeck.de/
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