When SSL is enabled, why is Nginx utilizing the incorrect server block?

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There are several reasons why Nginx might be utilizing the incorrect server block when SSL is enabled, including:

1. Incorrect servername configuration: If the servername directive in the SSL-enabled server block does not match the hostname in the client's request, Nginx may use a different server block with a matching server_name directive.

2. Default server configuration: If there is no explicit server block with a matching server_name directive, Nginx may use the default server configuration, which may not be the intended configuration for the SSL-enabled site.

3. SSL certificate misconfiguration: If the SSL certificate is misconfigured or does not match the server_name directive, Nginx may use a different server block with a matching SSL certificate.

4. Virtual hosts configuration: If the virtual hosts configuration is not properly set up or conflicting, Nginx may use a different server block than intended.

To avoid these issues, it is important to ensure that the servername directive in the SSL-enabled server block matches the hostname in the client's request, the SSL certificate is properly configured, and virtual hosts are set up correctly. Additionally, specifying the defaultserver parameter in the listen directive of the SSL-enabled server block can help ensure that the correct server block is used as the default.