Linux Troubleshooting 101

Everything is a DNS Problem

Everything is a Fscking DNS Problem
No really, Everything is a Fscking DNS Problem
If it's not a fucking DNS Problem ..
It's an arp problem
If it's not an arp problem...
It's a Full Filesystem Problem
If youre filesystem isn't full
It's a Spanning Tree problem
If it's not a spanning Tree problem...
It's a USB problem
If it's not a USB Problem
It might be an ntp problem 
If it's not an ntp problem
It's a sharing IRQ Problem
If it's not a sharing IRQ Problem
But most often .. its a Freaking Dns Problem !