A System.Net.WebException: Error: TrustFailure error occurs

Hello A System.Net.WebException: Error: TrustFailure error occurs
The operating system is Centos 6

The error contents are as follows

System.Net.WebException: Error: TrustFailure (Authentication failed, see inner exception.) —> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. —> Mono.Btls.MonoBtlsException: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED
at /builddir/build/BUILD/mono-6.12.0.90/external/boringssl/ssl/handshake_client.c:1132
at Mono.Btls.MonoBtlsContext.ProcessHandshake () [0x00048] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at Mono.Net.Security.MobileAuthenticatedStream.ProcessHandshake (Mono.Net.Security.AsyncOperationStatus status, System.Boolean renegotiate) [0x000da] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at (wrapper remoting-invoke-with-check) Mono.Net.Security.MobileAuthenticatedStream.ProcessHandshake(Mono.Net.Security.AsyncOperationStatus,bool)
at Mono.Net.Security.AsyncHandshakeRequest.Run (Mono.Net.Security.AsyncOperationStatus status) [0x00006] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at Mono.Net.Security.AsyncProtocolRequest.ProcessOperation (System.Threading.CancellationToken cancellationToken) [0x000fc] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
— End of inner exception stack trace —
at Mono.Net.Security.MobileAuthenticatedStream.ProcessAuthentication (System.Boolean runSynchronously, Mono.Net.Security.MonoSslAuthenticationOptions options, System.Threading.CancellationToken cancellationToken) [0x00262] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at Mono.Net.Security.MonoTlsStream.CreateStream (System.Net.WebConnectionTunnel tunnel, System.Threading.CancellationToken cancellationToken) [0x0016a] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebConnection.CreateStream (System.Net.WebOperation operation, System.Boolean reused, System.Threading.CancellationToken cancellationToken) [0x001ba] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
— End of inner exception stack trace —
at System.Net.WebConnection.CreateStream (System.Net.WebOperation operation, System.Boolean reused, System.Threading.CancellationToken cancellationToken) [0x0021a] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebConnection.InitConnection (System.Net.WebOperation operation, System.Threading.CancellationToken cancellationToken) [0x00141] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebOperation.Run () [0x0009a] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebCompletionSource1[T].WaitForCompletion () [0x00094] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0 at System.Net.HttpWebRequest.RunWithTimeoutWorker[T] (System.Threading.Tasks.Task1[TResult] workerTask, System.Int32 timeout, System.Action abort, System.Func`1[TResult] aborted, System.Threading.CancellationTokenSource cts) [0x000f8] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.HttpWebRequest.GetResponse () [0x00016] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebClient.GetWebResponse (System.Net.WebRequest request) [0x00000] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebClient.DownloadBits (System.Net.WebRequest request, System.IO.Stream writeStream) [0x000e6] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebClient.DownloadFile (System.Uri address, System.String fileName) [0x00088] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at System.Net.WebClient.DownloadFile (System.String address, System.String fileName) [0x00008] in <2f8f8f21cd414d84b3ddeb4281c7a63f>:0
at (wrapper remoting-invoke-with-check) System.Net.WebClient.DownloadFile(string,string)
at Duplicati.Library.AutoUpdater.UpdaterManager.CheckForUpdate (Duplicati.Library.AutoUpdater.ReleaseType channel) [0x000ee] in <8d4cb1693e00483189d3952c3f0ed20f>:0



Any solution? thank you

What back end are you using?

How do I check the back end?(__)

It’s on the “destination” section of your backup configuration. (Where are you saving your backup data?)

I’m saving it to google drive. Saved to team drive.

The same symptom occurs even if you add a new backup setting to another Google account.

What version of Duplicati is installed? What version of mono?

$ mono --version

I’m guessing either mono is out of date, or your trusted root certificate store (ca-certificates) is out of date.


Duplicati version is 2.0.6.3 beta and MonoVersion is : 6.12.0.90 .
The OS is Centos6, is there any way to update the trusted root certificate store (ca-certificates)?

Thank you.

I’m not sure, but to see if we are on the right track, please try setting this option on page 2 of your backup:

Save your backup config and try to run a backup again. If it works then I think we are on the right track.


I clicked the Test Connection button but nothing happens

Add advanced option: What hash value should I enter in Accept-any-ssl-certificate?

What value should I enter?

thank you

No hash value is required for that option, because it tells Duplicati to accept ANY certificate.

What happens if you save the config and try to run a backup?


When I save the settings and run a backup, nothing happens.

The log occurs as shown in the picture

Saving the settings is normal.
However, there is no response when running the backup.

Thank you

I see a “connection timed out” error now, which sounds like Duplicati can’t reach your backup destination.

How to solve it? thank you

Do some basic network tests from the machine that is running duplicati:

nslookup duplicati-oauth-handler.appspot.com
ping duplicati-oauth-handler.appspot.com
telnet duplicati-oauth-handler.appspot.com 443

nslookup should return IP address, ping should give you replies, and telnet should connect (not give you a connection timeout error).


ping communicates well as in the picture

Authentication token error occurs even when the Accept-any-ssl-certificate option is enabled

Yes because now you have a different problem from your first post. The problem now is that the connection to that destination doesn’t appear to work. What happened with that third command (telnet)? It looks like you may not have pressed enter.

When I type telnet duplicati-oauth-handler.appspot.com 443 I get a blank screen as shown in the picture

That’s good, that means a basic connection test succeeded. Not sure why you are getting a connection timeout when you try to run a backup though.