I looked at the FAQ. I know I'm using Jazz Jackrabbit 1.23. I just used the list server patch. The FAQ doesn't tell me anything else I can do, besides check the list servers. And I did chack and they were up.

I have no idea why it keeps happening.

I have a DSL connection.
I have a router, and a home network.
I possibly have a firewall.
I'm not sure about my ports being open or closed. I don't know how to open or close them.