I haven't played Fallout in a while due to this problem so maybe the new patches will fix it. Have not yet tried. But after spending countless hours playing the game it still will not let me advance anywhere in the Boomers quest. I have read the walkthrough which says that once you reach the gate someone approaches you and interacts with you. Only when I reach the gate no one does. The gate needs a key. But there is no key to be found. Please help.

I would love it if someone would answers this for me also! here I am on level 30 and I can't do anything else but go to the boomers and the stupid asses won't let me in, they won't even talk to me!

THE BOOMERS HAVE NOTHING TO DO WITH DLC

Wow, thanks that helped me a lot! :facepalm:

After a few intermittent attempts I eventually just ran through the ruined town and reached the gates before my hit points ran out. The Boomers expressed surprise, then let me in.

I'm not sure this helps you, though, as it sounds like a glitch that's stopping the guards appearing.