Sorry, I should have mentioned, it is on Windows 2008 R2 64 bit.
So I just ran the MSI file to upgrade.
As I mentioned, there were problems due to a diskexpansion, where the procedure was to make a copy of the folder containing the live indexes, in the service window, Splunk was stopped, and a last copy was made, the live disk was then renamed, and the new disk renamed to the old disks name.
That gives me a copy off the folder kvstore\mongod on the old live disk.
As there were problems with the copy being a copy, not a mirror (duplicate buckets), I had a cleaning job to do, and since Mongod did not start, I assumed it had similar problems.
We do not really use KVstore at the moment, so I deleted the folder, and let Splunk recreate it.
Now there are no entried in mongod.log, but it still fails to start.
So I tried to copy the "backup" back to the live folder, and I get the SSL errors, and it still wont start.
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