You can refresh your DNS-cache — there is a master HUGE prime-number, that enables all internet encryption — rarely, this number “gets-out”, and the internet-authorities have to come-up, with a new huge prime-number, but over a billion people have to refresh their DNS-caches — there is a terminal-command, for this — On modern Macs, it is :
dscacheutil -flushcache
Also, an active VPN, can interfere with SOME websites (especially banking websites) — turn off, or “snooze”, your VPN .