We are aware of the connectivity issue with the error code "42:1020:101:4457:101". We are now looking into this, and we will provide an update once we have more information. At this time, there is no need for additional Support tickets.
Thank you for your patience and understanding.
For more information, refer to this link: https://en-forum.guildwars2.com/topic/130473-connection-to-login-server-lost