The MUUG mirror appears to be useless for using for yum updates.
Running yum against it works for a while but often dies with:
---> Downloading header for ntp to pack into transaction set. ftp://ftp.muug.mb.ca/mirror/.1/fedora/linux/core/updates/4/i386/ntp-4.2.0.a.20050816-0.FC4.i386.rpm: [Errno 4] IOError: [Errno ftp error] [Errno ftp error] 502 Command REST not allowed by policy. Trying other mirror.
It looks like REST is denied by ftp.muug.mb.ca and yum doesn't seem to provide a way to disable using REST.
Any chance the server could be made to allow this? Or any chance of mirroring it via http too?