Are you using a custom certificate, and is it secured with a password? This error suggests an incorrect password, or possibly the password uses special characters and mongod doesn't like them. I found a case where someone using mongod and logging in from the command line had to escape out the special characters in their password. I don't see how that would be an issue with Splunk's implementation o mongod, but might be a good thing to test. In the meantime, I will continue researching as I am working with another Splunk user encountering the same message.
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