When URLs are just not resolving the way you want it, to time to clear or flush the dns nameserver local cache –
How to clear the local DNS cache….
OSX 10.10
sudo discoveryutil udnsflushcaches
OSX 10.9
dscacheutil -flushcache; sudo killall -HUP mDNSResponder
OSX 10.7 – 10.8
sudo killall -HUP mDNSResponder
OSX 10.5 – 10.6
sudo dscacheutil -flushcache
Windows
ipconfig /flushdns
Linux (depending on what you’re running)
/etc/init.d/named restart
/etc/init.d/nscd restart