Make WordPress site secure through HTTPS and SSL

If the meta tag is generated by your theme, you can rewrite the URL to https:// if the whole site is forced to use SSL, or better yet, use is_ssl() to check if the page is using https:// and write the URL on the fly.

You may have problems with plugins that don’t take SSL into account and hard-code links like this one. If that’s the case, ask the author to change it, or find/create a new one.