SignalR - Winform Client not able to connect to server

ankit dhiman 1

Hi I have a web api hosting the SignalR server and trying to connect to it from Window application. but I am getting below error.

Message : The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
Inner Exception : The remote certificate is invalid according to the validation procedure.

My Api has a SSL certificate configured, How can I connect to that SignalR server from my Window App ?

Daniel Zhang-MSFT 9,626 Reputation points

2021-05-11T05:48:23.533+00:00
Hi @ankit dhiman ,
The error message indicates that it is caused by the certificate, so you can follow the SᴇM's solution in first.
And it is also caused by self-signed and not signed by a trusted certificate authority.
You can try to add a certificate validation handler(Returning true will allow ignoring the validation error).

ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;

If not successful, please provide more details and some related code.
Best Regards,
Daniel Zhang
Daniel Zhang-MSFT 9,626 Reputation points

2021-05-17T08:24:09.423+00:00

Hi @ankit dhiman ,
Do you still meet this issue? If so, could you please share more detailed information and the relevant code code. I am looking forward to seeing your message.
Best Regards,
Daniel Zhang

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