EDIT: THIS HAS BEEN RESOLVED for reasons unknown. It may have been a temporary issue.
I recently opened up a server with GGServers, and historically I haven't had any major issues with them. This time, however, I can't connect to it with my home network at all. The only way to get online is to join a network called "xfinitywifi", which comes with Comcast routers. However, there is major block and chat delay, making SMP is practically unplayable. The server has 1gb ram. My OS is Zorin 12. Could this be a network firewall or is it an issue with the server?