A similar, common issue is to not have the machine's hostname pointing to a valid IP address in /etc/hosts (99% of the time it should be loopback, some like to

A similar, common issue is to not have the machine's hostname pointing to a valid IP address in /etc/hosts (99% of the time it should be loopback, some like to point it to a fixed eth0 address), which causes delays in various part of an otherwise fine OS.