Yum in Fedora 11 could use some work on error reporting.  While I have no doubt the following message was technically true – it wasn’t very helpful in diagnosing the problem.  This failure was caused by the loss of Internet connectivity.

Errors were encountered while downloading packages.
boa-0.94.14-0.12.rc21.fc11.i586: Caching enabled but no local cache of
/var/cache/yum/fedora/packages/boa-0.94.14-0.12.rc21.fc11.i586.rpm
from fedora