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| Author | Forum: PowerTCP Mail for .NET Topic: Observation on ImapConnect SSlProtocols example in documentation |
| kadorken From: Baden, ON Canada Posts: 2 Member Since: 07/23/21 |
posted July 23, 2021 9:31 AM In http://dotnet.dart.com/help/ptmlnet/webframe.html#Dart.Mail~Dart.Mail.Imap~Connect.html the example has the line //Optionally set the protocols available for SSL/TLS negotiation (defaults to SslProtocols.Default) //TLS 1.1/1.2 requires .NET 4.5+. See the SslProtocols MSDN documentation for more information. myImap.Session.Security.Protocols = SslProtocols.Tls | SslProtocols.Ssl3; However, I find I must use the following to get anything except 'Tls' (1.0) //Trying to pass Protocols.None per the MSDN documentation (https://docs.microsoft.com/en-us/dotnet/api/system.security.authentication.sslprotocols?view=net-5.0#System_Security_Authentication_SslProtocols_Default) // is rejected by // System.ArgumentException // System.Net.Security.SslState.ValidateCreateContext(Boolean isServer, String targetHost, SslProtocols enabledSslProtocols, X509Certificate serverCertificate, X509CertificateCollection clientCertificates, Boolean remoteCertRequired, Boolean checkCertRevocationStatus, Boolean checkCertName) // in .NET 4.0 at least // Default only permits TLS 1.0 and SSL3; we need to enable the others explicitly Protocols = System.Security.Authentication.SslProtocols.Ssl3 | System.Security.Authentication.SslProtocols.Tls11 | System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls Not sure if you want to adjust your documentation and or code examples but I thought at least if someone else follows my trail they will find this topic. |
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