Hi!
I implemented a simple gRPC client in C# .NET Framework
4.7.2 (WinHttpHandler) and a gRPC server in Python3 (grpcio 1.46.0) for
testing.
In C# .NET Framework i can use only client and it is mandantory to using
TLS with WinHttpHandler. Following code parts show my solution for it. I
could generate well the cert and key for my server, is my code correct to
use it for TLS client?
WinHttpHandler handler = new WinHttpHandler()
{
SslProtocols = SslProtocols.Tls,
WindowsProxyUsePolicy = WindowsProxyUsePolicy.DoNotUseProxy
};
X509Certificate2 cert = new X509Certificate2("server.crt");
handler.ClientCertificates.Add(cert);
GrpcChannelOptions options = new GrpcChannelOptions() { HttpHandler =
handler };
this.channel = GrpcChannel.ForAddress(this.textBox_url.Text, options);
this.client = new GExchange.GExchangeClient(this.channel);
When i test it with my gRPC Python server and try to call a gRPC method, i
got an "A connection with the server could not be established" exception in
C# then i also got an "UNSUPPORTED_PROTOCOL" error in Python server log.
Can somebody help what is this issue? It seems to me gRPC Python server
requires an other cryptographic protocol for example TLS v1.3 maybe, but in
C# .NET Framework for WinHttpHandler i can use only TLS v1.0, v1.1, v1.2.
Can somebody help how can i change TLS version of my gRPC Python server to
any older version? By the way, if i test it in a Python client and Python
server everything is working well.
gRPC Python server error:
E0511 17:55:18.799000000 14676 src/core/tsi/ssl_transport_security.cc:1495]
Handshake failed with fatal error SSL_ERROR_SSL: error:100000f0:SSL
routines:OPENSSL_internal:UNSUPPORTED_PROTOCOL.
D0511 17:55:18.802000000 14676
src/core/lib/security/transport/security_handshaker.cc:181] Security
handshake failed:
{"created":"@1652284518.802000000","description":"Handshake
failed","file":"src/core/lib/security/transport/security_handshaker.cc","file_line":377,"tsi_code":10,"tsi_error":"TSI_PROTOCOL_FAILURE"}
D0511 17:55:18.806000000 14676
src/core/ext/transport/chttp2/server/chttp2_server.cc:427] Handshaking
failed: {"created":"@1652284518.802000000","description":"Handshake
failed","file":"src/core/lib/security/transport/security_handshaker.cc","file_line":377,"tsi_code":10,"tsi_error":"TSI_PROTOCOL_FAILURE"}
C# .NET Framework exception:
Status(StatusCode="Internal", Detail="Error starting gRPC call.
HttpRequestException: An error occurred while sending the request.
WinHttpException: Error 12029 calling
WINHTTP_CALLBACK_STATUS_REQUEST_ERROR, 'A connection with the server could
not be established'.",
DebugException="System.Net.Http.HttpRequestException: An error occurred
while sending the request. ---> System.Net.Http.WinHttpException: Error
12029 calling WINHTTP_CALLBACK_STATUS_REQUEST_ERROR, 'A connection with the
server could not be established'.
at System.Threading.Tasks.RendezvousAwaitable`1.GetResult()
at System.Net.Http.WinHttpHandler.<StartRequestAsync>d__122.MoveNext()
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task)
at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Grpc.Net.Client.Internal.GrpcCall`2.<RunCall>d__73.MoveNext() in
/_/src/Grpc.Net.Client/Internal/GrpcCall.cs:line 493")
--
You received this message because you are subscribed to the Google Groups
"grpc.io" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/grpc-io/e6d921a7-94fe-4f66-9e6b-9da152775f31n%40googlegroups.com.
