AutoUpdate PostgreSQL dataset Not Working

Hello everyone, I have a question abount the dataset autoupdate.

We have some datasets connected directly to a postgresql database locatted in a rds of Amazon.

If I try to update those dataset manually I have not got any inconvenients but the autoupdate is not working.

This is the error that shows me,

Error del origen de datos An error happened while reading data from the provider: 'Npgsql.Tls.ClientAlertException: CertificateUnknown: Server certificate was not accepted. Chain status: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. . at Npgsql.Tls.TlsClientStream.SendAlertFatal(AlertDescription description, String message) at Npgsql.Tls.TlsClientStream.ParseCertificateMessage(Byte[] buf, Int32& pos) at Npgsql.Tls.TlsClientStream.TraverseHandshakeMessages() at Npgsql.Tls.TlsClientStream.<GetInitialHandshakeMessages>d__43.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Npgsql.Tls.TlsClientStream.<PerformInitialHandshake>d__72.MoveNext()'. The exception was raised by the IDbCommand interface. Table: calendar.

Does anyone knows how to resolve this?

Thanks in advanced