We've had some issues with our domain provider (1&1) automatically resetting our CNAME record for a subdomain (which is
I've spoken to them about this and they say they're resetting it because it's "inadvisable" to have a CNAME on a
www subdomain, stating that Tim Berners Lee designed it to only be used with the root. This is news to me. As I understand it, there is nothing special about the
www subdomain in a technological sense.
It may be unusual, but in our case its use with a CNAME is very deliberate. Is it actually breaking some technological best practice?