It turns out many players are failing to connect outside of DDOS and hang at authentication due to DNS issues. If you're still having trouble connecting to Octo please try this solution.
Navigate to C:\Windows\System32\drivers\etc and edit the hosts.txt with admin notepad to include:
185 165 170 59 normal octowow st (add periods where appropriate)
This should fix the issue.
Source: r/wowservers · by /u/Firm-Environment-253