Suddenly stopped working

Hi there.

I’m using this plugin for quite some time and it did what it should do.
I can access my page from the intranet via https://myWeb and from outside via https://www.myweb.de

But since i updated to WP 4.7. it just sopped working.
Even when calling from the intranet all links to other subpages etc. are resolved as from outside which leads to an additional login procedure.

Any hints?

Thanks Kai