Error 0 : Error opening socket ssl://projects.backdropcms.org:443 (solved)

After moving a site from Pantheon to shared hosting, I had an error message under “Install new modules”.

• "Encountered an error when trying to fetch results from Backdrop. Error 0 : Error opening socket ssl://projects.backdropcms.org:443"

I fixed the error by adding the following to my php.ini file.

• extension_dir = "ext"
• extension=php_openssl

With this, I was able to view and install a module.