1. Clear the game cache (cog icon in the top right > clear up system)
2. Flush the DNS cache (open ‘command prompt’ on the PC and type ``ipconfig /flushdns`` and hit enter)
3. Reboot the PC (to be extra sure, reboot the modem / router too)

If that does not work, you may try these other two options:
- VPN (you'll have to try all servers available to you, recommend a server furthest from your physical location)
- Clean reinstall of the client (back up your logins before doing so)

If after all that, you need to contact your ISP (internet service provider).