Attempting to connect during backup set-up garners me the error message,
Failed to connect: The underlying connection was closed: An unexpected error occurred on a receive.
After a very long (10+ min) wait time.
Duplicati was working just fine until its DB crapped out in mid-December and I tried to do a rebuild. Rebuild would never finish, so I eventually killed the rebuild and deleted the backup (including files on BackBlaze). When I tried to re-create the backup, I ran into this error.
Duplicati is running in Service mode. Nothing has changed on the server aside from Windows Updates. Server is a Windows Server 2012 Standard system with two Intel Xeon X5355 CPUs and 16Gb of RAM. I have confirmed that all settings for BackBlaze are correct (I have a second system running the same credentials, I updated its backup with the same credentials but different bucket and connected successfully).
The Log page gave me this:
• Jan 24, 2019 12:29 AM: Request for http://localhost:8200/api/v1/remoteoperation/test gave error
System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. —> System.ComponentModel.Win32Exception: The client and server cannot communicate, because they do not possess a common algorithm
at System.Net.SSPIWrapper.AcquireCredentialsHandle(SSPIInterface SecModule, String package, CredentialUse intent, SecureCredential scc)
at System.Net.Security.SecureChannel.AcquireCredentialsHandle(CredentialUse credUsage, SecureCredential& secureCredential)
at System.Net.Security.SecureChannel.AcquireClientCredentials(Byte& thumbPrint)
at System.Net.Security.SecureChannel.GenerateToken(Byte input, Int32 offset, Int32 count, Byte& output)
at System.Net.Security.SecureChannel.NextMessage(Byte incoming, Int32 offset, Int32 count)
at System.Net.Security.SslState.StartSendBlob(Byte incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.BeginWrite(Byte buffer, Int32 offset, Int32 size, AsyncCallback asyncCallback, Object asyncState)
at System.Net.ConnectStream.WriteHeaders(Boolean async)
— End of inner exception stack trace —
at Duplicati.Library.Interface.BackendExtensions.TestList(IBackend backend)
at Duplicati.Server.WebServer.RESTMethods.RemoteOperation.TestConnection(String url, RequestInfo info)
at Duplicati.Server.WebServer.RESTHandler.DoProcess(RequestInfo info, String method, String module, String key)