I receive "Set Top Box is not responding" or "Bad Gateway" messages when I try to access my DVR through the FiOS TV Central website. Had this problem before and Mike_VZ here on the forum did something that made it work.
Tried: powering down set top box, router; running "AutoCorrect" from the DVR menu;
running the self diagnostic test on your DVR set top box (get 'Listener 1 Started') -- still no go.
Hesitate to contact support directly (calling or via chat) 'cause the few times I have whatever they did wiped out my "Favorites" list -- a big hassle to re-do!
So, am hoping another VZ tech here on the forum can work their magic!!