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Before generating of CSR by zimbra i have set during setup CN to server.domain.tld and added www.server.domain.tld to SAN. Generated CSR SAN have two separate values "server.domain.tld" and "www." .
I have try web interface installer and zmcertmgr. With the same result.
Bug ?
Bugzilla
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Source
Problem with subjectAltName in SSL CSR 
Linear Mode
