Problems adding/configuring indexers

Sonarr version (exact version): 2.0.0.5054 (Qsonarr)
Mono version (if Sonarr is not running on Windows): 5.4.1.6.0
OS: QTS 4.3.3.0378 (Qnap)
((Debug logs)):

17-12-11 16:48:55.2|Info|RssSyncService|Starting RSS Sync
17-12-11 16:48:55.2|Warn|FetchAndParseRssService|No available indexers. check your configuration.
17-12-11 16:48:55.3|Info|DownloadDecisionMaker|No results found
17-12-11 16:48:55.3|Info|RssSyncService|RSS Sync Completed. Reports found: 0, Reports grabbed: 0
17-12-11 17:04:13.9|Info|RssSyncService|Starting RSS Sync
17-12-11 17:04:15.4|Warn|FetchAndParseRssService|No available indexers. check your configuration.
17-12-11 17:04:16.7|Info|DownloadDecisionMaker|No results found
17-12-11 17:04:30.4|Info|RssSyncService|RSS Sync Completed. Reports found: 0, Reports grabbed: 0
17-12-11 17:18:50.6|Warn|Rarbg|Unable to connect to indexer

[v2.0.0.5054] System.Net.WebException: DNS Name Resolution Failure: 'torrentapi.org'
  at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x0015e] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Common.Http.Dispatchers.FallbackHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x0003c] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Common.Http.HttpClient.ExecuteRequest (NzbDrone.Common.Http.HttpRequest request) [0x0007e] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Common.Http.HttpClient.Execute (NzbDrone.Common.Http.HttpRequest request) [0x00000] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Common.Http.HttpClient.Get (NzbDrone.Common.Http.HttpRequest request) [0x00007] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Common.Http.HttpClient.Get[T] (NzbDrone.Common.Http.HttpRequest request) [0x00000] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Core.Indexers.Rarbg.RarbgTokenProvider+<>c__DisplayClass4_0.<GetToken>b__0 () [0x00084] in <65fd07448b304721a1cf8bbfea4394c9>:0 
  at NzbDrone.Common.Cache.Cached`1[T].Get (System.String key, System.Func`1[TResult] function, System.Nullable`1[T] lifeTime) [0x0006a] in <22414d89e85c45babce99539812a436f>:0 
  at NzbDrone.Core.Indexers.Rarbg.RarbgTokenProvider.GetToken (NzbDrone.Core.Indexers.Rarbg.RarbgSettings settings) [0x00044] in <65fd07448b304721a1cf8bbfea4394c9>:0 
  at NzbDrone.Core.Indexers.Rarbg.RarbgRequestGenerator+<GetPagedRequests>d__12.MoveNext () [0x0014a] in <65fd07448b304721a1cf8bbfea4394c9>:0 
  at System.Linq.Enumerable.TryGetFirst[TSource] (System.Collections.Generic.IEnumerable`1[T] source, System.Boolean& found) [0x00045] in <204ed983d593479a8dff85dd3269e1a1>:0 
  at System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x00000] in <204ed983d593479a8dff85dd3269e1a1>:0 
  at NzbDrone.Core.Indexers.HttpIndexerBase`1[TSettings].TestConnection () [0x0001f] in <65fd07448b304721a1cf8bbfea4394c9>:0 

17-12-11 17:18:51.3|Warn|NzbDroneErrorPipeline|Invalid request Validation failed: 
 -- Unable to connect to indexer, check the log for more details

Description of issue:
Whenever I try to configure an indexer I get a “Unable to connect to indexer, check the log for more details” message.
The log is above.
It looks like a DNS problem but I can curl to ‘torrentapi.org’ with no problems and have configured Google’s DNS servers on the system.
I can also use Qnap’s Download Station to search and download torrents ok which leads me to believe the issue is not DNS related.
I looked around the forum for similar issues but have found nothing that helped me.

Thanks for any help.

(Make sure debug logging is enabled in settings and post the full log to hastebin/pastebin/dropbox/google drive or something similar, do not post them directly here)

Please link to logs when posting them.

It definitely looks like a DNS problem, though I’m not sure why it works for other services on that system and not Sonarr, perhaps an issue with that version of mono, though I haven’t heard of issues with mono 5.4 on other platforms.

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