I have spent far too much of my life on SharePoint.
Having it internet facing has never been a good idea.
Not really what it is meant for, though the promo verbiage
on that has changed over different versions.
Some folks wanted SharePoint as their "web server",
I would set that installation up entirely separted from
all other instances they may have on the network.
Some folks wanted SharePoint as their "web server", I would set that installation up entirely separted from all other instances they may have on the network.