Graal server blocked your wifi or did your wifi block the Graal servers? If the options given from other members do not work, then perhaps contacting your ISP can be the next step.

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I really know nothing of networks, but in the case that you need to add the IP of Graal to play it, it could be one of these:
104.20.47.194 (era.graalonline.com)
167.114.51.244 WhoIs