After years of not having issues with game nor launcher I suddenly have issues logging in via the launcher. Everything shows up fine EXCEPT the login section (so no fields for username, password, 1-time password or login button).

In some instances nothing further happens. Sometimes it quits giving me the HTTPS error (-2146697211), other times it gives me HTTPS error (7).

So far I've tried the following:
Reinstalling
Making sure drivers are up to date
Flushing DNS
Reconfiguring IP
Adding the gateway sites to Firewall
Turning Firewall off (this includes windows defender)
Turning Virusscanner off
Portforwarding
Deleting the Remnant Patch files

Now here's a funny one.
***Deleting the FFXIVboot.CFG allows me to log back in and play but when I exit the game the problem reoccurs unless I delete that file AGAIN.

As a result I've tried the Browser version type line (I've set it to 0,1,2,3; no result)

I wouldn't for the life of me know any more possible solutions for a problem that occurs with a 1kb file preventing me from logging in from the launcher. Note That this problem does not occur on any FF-website, and I can log in normally (albeit once) upon deletion of the boot-file so I would say the problem lies somewhere in that file.