Pkg.update hangs on checked-out packages

On OS X v10.11.6, with julia-v0.5.0, Pkg.update() hangs for a while on the packages where I have checked out master. The repo is still a public GitHub repo in both cases where this happens. It hangs for several minutes on (for example) INFO: Updating SGP4 master.... Is this related to some known issue?

I believe I found the issue: I have several modules from an internally-hosted repository, and when I’m not connected to the internal network the hanging is due to the inability to communicate with those repos. The line on which things hang don’t appear to coincide with those internally-hosted packages, which is why I was getting confused. Sorry for the noise.