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SSL Certificate & Availability Group Question

  • January 16, 2024 at 2:32 pm

    #4362668

    Hello-

    I hope someone can help with this..

    I have 4 servers below and would like to confirm my thought is correct by ordering 4 separate SSL certificates *with each separate SQL instance name* or order 1 with only the AG name and import the SSL certificate to each individual SQL instance.

    AGSQLPROD_AG (AG Name)

    -        SQLPRODServer1 (primary)

    -        SQL PRODServer2(Secondary

    -        SQLPRODServer1DR (DR Site)

    -        SQLPRODServer2DR (DR Site)

    My thought is that since the AG listener will failover to any of the nodes below, the DNS should take care of any connection issues, therefore I should not create any SSL certificates with the AG name and instead create 4 SSL certificates with the physical SQL instance names.

    Any input is greatly apricated!

     

    Thanks

  • January 17, 2024 at 3:10 pm

    #4363314

    Thanks for posting your issue and hopefully someone will answer soon.

    This is an automated bump to increase visibility of your question.

  • January 17, 2024 at 3:31 pm

    #4363341

    Personally, I would do a single wildcard certificate. you will need the hostname of each SQL server however and the listeners at minimum

  • January 17, 2024 at 8:00 pm

    #4363447

    SSL uses the FQDN - if someone is connecting to SQL Server using listener.domain.com then the certificate must have that same name.  If it doesn't have the same name then it cannot create the SSL connection.

    What I would do is request a certificate with all of the possible FQDN entries that would be used - with the listener name being the primary and all other names setup as a SAN (Subject Alternative Name) on that certificate.

    Installing that certificate on all nodes will then allow someone to connect directly to the instance by node name, listener name - or any other DNS aliases that have been defined and setup as a SAN entry on the certificate.

    Jeffrey Williams
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    ― Charles R. Swindoll

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