This error comes from the ALPN TLS extension, which you need your SSL endpoint to support. If you are using NPN, it is unlikely you will be able to connect.
On Thursday, September 6, 2018 at 11:06:02 AM UTC-7, [email protected] wrote: > > Hello, I am connecting to a server which has TLS support with SSL certs. I > am getting a SSL Handshake error on *Android* app client. I also use > *useTransportSecurity()* to deal with TLS negotiation type. Is there any > workaround to get away with this error without certificate pinning? > > > > ---- > Caused by: java.lang.RuntimeException: protocol negotiation failed > > at > io.grpc.okhttp.OkHttpProtocolNegotiator.negotiate(OkHttpProtocolNegotiator.java:96) > > at > io.grpc.okhttp.OkHttpProtocolNegotiator$AndroidNegotiator.negotiate(OkHttpProtocolNegotiator.java:147) > > at > io.grpc.okhttp.OkHttpTlsUpgrader.upgrade(OkHttpTlsUpgrader.java:63) > > at > io.grpc.okhttp.OkHttpClientTransport$2.run(OkHttpClientTransport.java:474) > > at > io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123) > > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) > > > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) > > > at java.lang.Thread.run(Thread.java:764) > ---- > > > > And this is how I generate my channel : > > ManagedChannel mChannel = OkHttpChannelBuilder.*forAddress*(host, port) > .useTransportSecurity() > .build(); > > > > > > Appreciate your time and help. > -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/grpc-io. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/b1fb55e3-0779-47ce-bf53-92a3617c65e8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
