Sometimes the list server software can crash (and is automatically restarted) or can hang for periods of time.

Sometimes the connection could be broken my end, as a lot of work is going on at my location at the moment, with a lot of network restructuring currently going on, which can result in digiex-web (the server running the list server) being unable to direct data to the internet router which is in a different location.

And sometimes, the internet could just be broken, problems outside my control (eg ISP).

So if you cant connect, it could be either of those three reasons