Hello,
My CalDav connection in eMClient suddenly stopped working, with an exception error:
12:53:35 CalDavMail [CalDAV / CardDAV] MailClient.Accounts.ConnectionException: An error occurred while sending the request.
When looking at the full logs:
12:53:35 CalDavMail [CalDAV / CardDAV] MailClient.Accounts.ConnectionException: An error occurred while sending the request.
—> System.Net.Http.HttpRequestException: An error occurred while sending the request.
—> System.IO.IOException: The read operation failed, see inner exception.
—> System.Security.Authentication.AuthenticationException: The remote certificate was rejected by the provided RemoteCertificateValidationCallback.
at System.Net.Security.SslStream.SendAuthResetSignal(ProtocolToken message, ExceptionDispatchInfo exception)
at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm)
at System.Net.Security.SslStream.ReplyOnReAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Byte[] buffer)
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](TIOAdapter adapter, Memory1 buffer) --- End of inner exception stack trace --- at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](TIOAdapter adapter, Memory1 buffer)
at System.Net.Http.HttpConnection.FillAsync(Boolean async)
at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean async, Boolean foldedHeadersAllowed)
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
— End of inner exception stack trace —
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.AuthenticationHelper.SendWithNtAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean isProxyAuth, HttpConnection connection, HttpConnectionPool connectionPool, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(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.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at MailClient.Protocols.InteractionController.CerificationValidationMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at MailClient.Protocols.Common.HttpClientLoggingHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellationToken)
at MailClient.Protocols.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
— End of inner exception stack trace —
at MailClient.Protocols.CalDav.ProtocolCommands.Connector.RunCommand(CalDavAccount account, ICommand command, CancellationToken cancellationToken)
at MailClient.Protocols.CalDav.FolderSynchronizer.UpdateOptions(Uri[] baseUris, CancellationToken cancellationToken)
at MailClient.Protocols.CalDav.FolderSynchronizer.Bootstrap(WorkerStatus status, CancellationToken cancellationToken)
at MailClient.Protocols.CalDav.CalDavGenericCommand.Execute(WorkerStatus status)
at MailClient.Commands.Command.Process(WorkerStatus status)
It seems eMClient is no longer able to verify the certificate:
The remote certificate was rejected by the provided RemoteCertificateValidationCallback
It is a self-signed certificate, but it is installed in the Trusted Root Certificate store in Windows. And it used to work seemlessly.
How can I fix this issue? Thanks for your help.
Peter