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These are some of the common errors you may see when adding an indexer
The underlying connection was closed: An unexpected error occurred on a send.
This is caused by the indexer using a SSL protocol not supported by .net 4.5, to resolve this you will need to install .net 4.5, which is available on Vista/Server 2008 and above (if you're on XP/Server 2003 its time to upgrade).
Error getting response stream (Write: The authentication or decryption has failed.): SendFailure
This is caused by the indexer using a new certificate authority that is not trusted by mono 2.10. The solution is to upgrade to mono 3.x, on Ubuntu this can be done via this method: http://stackoverflow.com/a/13384233/882971 We recommend upgrading to mono 3.x to fix a number of bugs and add support for .net 4.5 features.
The request timed out
Sonarr seems to have issues with certain TLS versions or configurations. If you get the following error messages in your log:
System.Net.WebException: The request timed out: 'https://example.org/api?t=caps&apikey=(removed) ---> System.Net.WebException: The request timed out
And you can see the following in the trace logfile:
<DATE&TIME>|Trace|FallbackHttpDispatcher|Curl not available, using default WebClient.
You might fix it by installing libcurl3. On Ubuntu/Debian use
apt install libcurl3