When offline, we periodically attempt to contact the remote server to determine if we are back online. This is triggered by a request, which then blocks until the server either responds or we hit the timeout.

It would be nicer behavior if we instead always returned the cache data if we are marked offline at the time the request occurs and instead attempt to reconnect to the remote server out-of-band (similar to the way the midpoint cache works).

This will mean that users won't get intermittent lag in their NSS lookups.