Transport Secure Layer (TLS) facilitates secure computer communication over network. TLS 1.2 is the latest available version that is gaining momentum as it is much more secure than its predecessors (TLS 1.1/1.0 and SSL 1.0/2.0/3.0).
Microsoft SharePoint Server supports TLS 1.2 from version 2010 onwards. If you want to enable it, obviously, you also need to configure SQL connection to strictly use TLS 1.2.
From version 8.1 onwards, NetBackup introduces a new feature called Secure Communication. Basically it is now mandatory for all NetBackup hosts to communicate securely via TLS 1.2.
Bear in mind, however, that the above feature does not yet extend to NetBackup’s interaction with SharePoint farm. If you upgrade the NetBackup software on your SharePoint farm to 8.1 or 8.1.1, and the servers happen to use TLS 1.2, content database backup and restore will fail. SQL agent backup does work fine, however.
You will see the following error in SQL Server’s bpbkar log:
03:42:10.599 [1220.796] <2> ov_log::V_GlobalLog: INF - SQL Error Source:
Microsoft OLE DB Provider for SQL Server
03:42:10.599 [1220.796] <2> ov_log::V_GlobalLog: INF - SQL Error Description:
[DBNETLIB][ConnectionOpen (SECCreateCredentials()).]SSL Security error.
PS: This log is located in \Veritas\NetBackup\logs\bpbkar\. Create the folder if it does not exist and re-run the backup to get the log.
This issue will be fixed in NetBackup 8.1.2 which should be released soon. Meanwhile, you may want to roll back the NetBackup client software on the SharePoint Servers back to 7.7.3.
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