Architecture question:

Do certificate serial numbers within a multi-trier certificate authority
chain need be globally unique? 

A Thunderbird user recently received the following error because his
cert serial number, as signed by one CA, matched the serial number of
the server, both of which were signed by CA signing certs signed by a
master CA 

"Your certificate contains the same serial number as another certificate
issued by the certificate authority. Please get a new certificate
containing a unique serial number"

Thanks,
~BAS

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