It seems this was also posted to SO: https://stackoverflow.com/q/52210169/4690866. I provided an answer there.
On Thu, Sep 6, 2018 at 12:57 PM 'Carl Mastrangelo' via grpc.io < [email protected]> wrote: > 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 > <https://groups.google.com/d/msgid/grpc-io/b1fb55e3-0779-47ce-bf53-92a3617c65e8%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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/CA%2B4M1oNf47aqcOc8wbq-yNwmsh_U_Qk%3Dxt9EEAW1FHAfmFbgwA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
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