Error 11001:
Host not found.
No such host is known. The name is not an official host name or alias, or it cannot be found in the database(s) being queried. This error may also be returned for protocol and service queries, and means that the specified name could not be found in the relevant database.
Can you ping that host name from a command prompt? (double check the IP resolves to the correct address)
Please make sure the Everything client is not running as an administrator.
Are you able to connect with the host IP instead of the host name? (Try ipv4 and ipv6).