If you're having issues accessing DG it means that either your IP, an IP group, or your locale are being blocked by the server's firewall for a variety of reasons.
DG has never worked for me. No matter which ISP, mobile connection i have used. May be they block whole region if one or few people spam or do something wrong from specific region. I know it is the firewall installed on their website is blocking me, but not sure about the reason.