Question: Temporary inability to login via Safari?
Seems to happen periodically. Safari (V11.1) with High Sierra 10.13.4 seems to automatically forget my login and I can't log in again. Clicking on "Sign in" (https://discussions.apple.com/login.jspa) just redirects to the welcome page (https://discussions.apple.com/welcome).
If I switch to Firefox (currently 60.0.1) I have no problem.
MacBook Pro, macOS High Sierra (10.13.3), 13" mid-2012 Core i5 2.5 (SSD)