ISP: Telekom Can't login to EU servers since last tuesday (April 19th). US servers still work for me. Reminds me of the problems Telekom users had in early 2021: EU servers were unplayable (lag, not G15 error) while US servers worked fine for us. If you find out how that problem was solved in February 2021 you may possibly find a fix again. (?)
I had less than a week without G15 issues and here I am again. I can log into my one character on Connery, but not onto any of my Emerald characters. ISP is Comcast/Xfinity if that's relevant.
It was working great from Friday 22nd until yesterday Evening (Sunday 24th). Just came back Home and Game Error G15 again on EU Server (Cobalt). ISP: Deutsche Telekom