I am about to go through the same thing (version 6.3.13 on 2008 nonR2) and migrating to cloud. I am remembering all the fun with "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server". I found this https://community.splunk.com/t5/Installation/Any-concerns-when-upgrading-from-Splunk-version-6-5-to-7-1/m-p/440633
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