It looks like the *.forums.wordpress.orgWordPress.org The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization. https://wordpress.org/ SSLSSL Secure Socket Layer - Encryption from the server to the browser and back. Prevents prying eyes from seeing what you are sending between your browser and the server. certificate has expired, since we’ve not yet migrated those forums to their main locale domains, can we please get the cert renewed?
Example URL: https://ru.forums.wordpress.org
Reported in: https://meta.trac.wordpress.org/ticket/1327