XenForo Website giving warnings with www

A

Alvin63

Guest
Suddenly, one of my forum websites won't load and is giving security warnings - this is in Firefox incognito mode (below). And all other browsers are similar. It will load if I use https only but not with https://www

Contacted server and they are talking about changing CNAME in dns records. But why is that needed - it's been perfectly ok for the past year or more so why does DNS need changing?

SWAS Private.webp

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