I needed X forwarding to work on this same virtual server. So, again, I “Googled” it.
I found the same error “X11 connection rejected because of wrong authentication.” that I was receiving being listed on more than one site. The site
gives the best how-to discussion on fixing this. It works, by the way.
p.s. I used http://www.howtogeek.com/howto/ubuntu/see-which-groups-your-linux-user-belongs-to/ to learn how find out to which group my username belonged.