Indexers unavailable due to failures: NzbSu

Sonarr version (2.0.0.5344):

Windows 7:

Messages from Logs:
Disabled Tls1.2 due to remote certificate error.
nable to connect to indexer: The request was aborted: Could not create SSL/TLS secure channel.
System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.
at System.Net.HttpWebRequest.GetResponse()
at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponse(HttpRequest request, CookieContainer cookies) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Http\Dispatchers\ManagedHttpDispatcher.cs:line 117
at NzbDrone.Common.Http.Dispatchers.FallbackHttpDispatcher.GetResponse(HttpRequest request, CookieContainer cookies) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Http\Dispatchers\FallbackHttpDispatcher.cs:line 53
at NzbDrone.Common.Http.HttpClient.ExecuteRequest(HttpRequest request, CookieContainer cookieContainer) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Http\HttpClient.cs:line 121
at NzbDrone.Common.Http.HttpClient.Execute(HttpRequest request) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Http\HttpClient.cs:line 57
at NzbDrone.Common.Http.HttpClient.Get(HttpRequest request) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Http\HttpClient.cs:line 264
at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider.FetchCapabilities(NewznabSettings indexerSettings) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\Newznab\NewznabCapabilitiesProvider.cs:line 62
at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider.<>c__DisplayClass4_0.b__0() in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\Newznab\NewznabCapabilitiesProvider.cs:line 35
at NzbDrone.Common.Cache.Cached1.Get(String key, Func1 function, Nullable1 lifeTime) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Common\Cache\Cached.cs:line 81 at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider.GetCapabilities(NewznabSettings indexerSettings) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\Newznab\NewznabCapabilitiesProvider.cs:line 35 at NzbDrone.Core.Indexers.Newznab.Newznab.get_PageSize() in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\Newznab\Newznab.cs:line 23 at NzbDrone.Core.Indexers.Newznab.Newznab.GetRequestGenerator() in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\Newznab\Newznab.cs:line 27 at NzbDrone.Core.Indexers.HttpIndexerBase1.TestConnection() in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\HttpIndexerBase.cs:line 334
:

Just started getting message Indexers unavailable due to failures: NzbSu. **
**Never had an issue till this. I’ve tried restarting Sonarr but it didn’t help unfortunately **
Thanks for any tips.
**Cheers!
: