I think that that particular error (404) is referring to the Maritz connection timing out before the page is complete. I've found that it happens when my own router (or server) seems to be dialed down or slow, not a problem on Maritz' side.
When it does occur, I click my wireless icon and ask it to repair itself. If that does not work I find that I have to take my laptop to the router and plug in to the LAN cable.
If I'm on the road, I'll move to a better free hotspot. I've found that in my area, big box, home improvement stores offer the best free wireless service.