Today, while I was playing Onyxia Realm, the game kicked me out and I can't log in anymore, it keeps telling me that - world server is down. Please take a look at what's going on? I can log in to other realms without a problem, but I can't log in to Onyxia.
Here for anyone still having this issue, the issue mostly occurs due to internet routing and only a few ISPs are affected worldwide.
Easy solution : Get a VPN, it usually fixes the routing by finding out a better option. (This is the one i use, Cloudflare One Client is a free VPN i use)
Difficult solution: Talk to your ISP support team and let them know that the routing for specific websites like logon.warmane.com are broken/irregular, they can also raise a ticket internally and get it fixed.