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The original was posted on /r/selfhosted by /u/TheRealSectimus on 2023-09-01 19:41:42+00:00.

Using docker and I can connect to the flaresolverr instance via the flaresolverr domain, the test completes (this is also the same setup I have for sonarr and radarr that work just fine).

Though running any cloudflare required domain goes like so:

without flaresolverr

with flaresolverr

My prowler logs show the following:

[Warn] ProwlarrErrorPipeline: Invalid request Validation failed: 
 -- : Unable to connect to indexer, please check your DNS settings and ensure IPv6 is working or disabled. The SSL connection could not be established, see inner exception. 
[Warn] Cardigann: Unable to connect to indexer 

[v1.7.4.3769] System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.
 ---> System.IO.IOException: Cannot determine the frame size or a corrupted frame was received.
   at System.Net.Security.SslStream.GetFrameSize(ReadOnlySpan`1 buffer)
   at System.Net.Security.SslStream.ReceiveBlobAsync[TIOAdapter](TIOAdapter adapter)
   at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm)
   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.AddHttp2ConnectionAsync(HttpRequestMessage request)
   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttp2ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
   at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponseAsync(HttpRequest request, CookieContainer cookies) in ./Prowlarr.Common/Http/Dispatchers/ManagedHttpDispatcher.cs:line 110
   at NzbDrone.Common.Http.HttpClient.ExecuteRequestAsync(HttpRequest request, CookieContainer cookieContainer) in ./Prowlarr.Common/Http/HttpClient.cs:line 171
   at NzbDrone.Common.Http.HttpClient.ExecuteAsync(HttpRequest request) in ./Prowlarr.Common/Http/HttpClient.cs:line 70
   at NzbDrone.Core.Indexers.IndexerHttpClient.ExecuteProxiedAsync(HttpRequest request, ProviderDefinition definition) in ./Prowlarr.Core/Indexers/IndexerHttpClient.cs:line 42
   at NzbDrone.Core.Indexers.HttpIndexerBase`1.FetchIndexerResponse(IndexerRequest request) in ./Prowlarr.Core/Indexers/HttpIndexerBase.cs:line 503
   at NzbDrone.Core.Indexers.HttpIndexerBase`1.FetchPage(IndexerRequest request, IParseIndexerResponse parser) in ./Prowlarr.Core/Indexers/HttpIndexerBase.cs:line 444
   at NzbDrone.Core.Indexers.HttpIndexerBase`1.TestConnection() in ./Prowlarr.Core/Indexers/HttpIndexerBase.cs:line 687

[Warn] ProwlarrErrorPipeline: Invalid request Validation failed: 
 -- : Unable to connect to indexer, please check your DNS settings and ensure IPv6 is working or disabled. The SSL connection could not be established, see inner exception.

Though I have nothing in my flaresolverr logs outside of the test done on flaresolverr itself, indicating that the request from prowlarr is probably malformed.

Any ideas appreciated!