I briefly tried tightening the fittings with a pipe wrench, but that didn't seem to work. I'm thinking the next thing I'll do is turn off the heat, loosen the connections that are dripping, clean them to make sure there is no grit or dirt on the threads and contact surfaces, and then tighten them again.
But, I am wondering..., would it also help to try adding a little bit of pipe dope to the fittings to try to help assure that they will seal completely? If so, is there any special type of pipe dope to use that is better for steam heat fittings?
My hunch is that no pipe dope is required or recommended, but I thought I'd ask.
P.S. I am going to also try posting this question at http://heatinghelp.com which is a website that someone here suggested to me in the past. I also bought a book there called "We Got Steam Heat!", but I am only up to page 31 so far so I don't know if this question is answered later in the book.