Thanks for the advice all, I will try to take it apart and clean. The disconnect is new to me but bought lightly used off Craigslist, came with the keg. I did my best to run some PBW and Star San through the whole shebang before using it. The leak is definitely out the bottom of the disconnect, not out of the top/hose.
I did tighten the post with a wrench, but I've never heard of keg lube.