Could not create SSL/TLS secure channel - Could the problem be a proxy server?

Question

I have a c# app that calls a web service method that authenticates using a certificate. The code works, because when it is installed on server A (without a proxy) it authen

Answer 1

I was having the same problem. In my case the certificates need the Network service access. You can check by

1. Open certificate MMC
2. Navigate to Certificates (Local Computer) > Personal > Certificates
3. Right click on your certificate and select All Tasks> Manage Private Keys… from the context menu
4. Set the appropriate permission