[Fixed] SSL_do_handshake() failed (SSL: error:0A00010B:SSL routines::wrong version number) while SSL handshaking to upstream nginx-proxy – Nginx

The Problem:

SSL handshake is failing while trying to establish a connection to the Nginx proxy server due to a mismatch in SSL versions. The error message indicates that the client is using a different version of SSL than the server, resulting in the "wrong version number" error.

The Solutions:

Solution 1: Use HTTP in proxy_pass directive

This error can be resolved by changing the proxy_pass directive in the nginx configuration file to use HTTP instead of HTTPS.

Currently, the proxy_pass directive is configured as follows:

proxy_pass https://www.api.coinhexa.com;

However, the upstream server is an HTTP endpoint. To fix this, change the directive to:

proxy_pass http://www.api.coinhexa.com;

This will ensure that nginx uses HTTP to communicate with the upstream server, resolving the version number mismatch error.