-If you using Antivirus give exception for demonbuddy or stop it when u want to use the bot.
-Disable Winndows Firewall
-Check your hosts file and if there any blocked auth server delete these lines ... you can access to hosts file on (...Windows\System32\Drivers\etc\hosts)
if still getting same error please contact with me via private message and include your teamviewer information to let me remote help..
king regards!