When you attempt to go to the HTTP wiki site, the HTTP server sends a "Moved Permanently" response forcing the browser to use HTTPS/SSL, but the certificate being provided by the HTTPS is not correct. The certificate has the following properties:
SAN: *.canonical.com, canonical.com
Both of these are invalid because the domain name of the site is wiki.ubuntu.com
I have not visited this site for a while, but today I was trying to reach a page about IPv6.
Questions: (1) Is this change recent? (2) Is this certificate expected?