Blocked Firewall port
rsync: failed to connect to contextgarden.net: Connection timed out (116) rsync error: error in socket IO (code 10) at clientserver.c(122) [receiver=3.0.2]
You are most probably behind a firewall. Make sure that port 873 is open. If you cannot make any changes yourself and if your admin objects, you probably won't be able to use rsync for the distribution.
Cygwin permission problems on Windows
texlua.exe: "Application failed to initialize (0xc0000022)"
One need to have a setting
but it should have been set automatically by mtx-update.lua. If you experience this problem, please report.