Sonarr, Mono, and TLS, Oh My

So my Sonarr on CentOS 7.3 just stopped working. Error contacting all newsnab indexers over https. Among a bunch of traces to Mono, it was throwing this exception:

Error: SecureChannelFailure (Object reference not set to an instance of an object)

The fix is simple but obscure:

Go here:


Add this under [Service]


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