I have a Google Apps account and I have setup my iPhone to fetch emails once every hour. Now if I'm at home on wifi or I use my cellular signal, the phone will fetch my emails every hour. However when at work and connected to the work wifi then it doesn't fetch. If I manually try to pickup my emails I get the following error message "imap.gmail.com is not responding" If I disconnect from my works wifi and use the cellular signal then I can fetch fine. This also seems to be the base on my MacBook and my colleagues iPad using our works wifi. Does anybody know why this would be happing and how to resolve it? Its probably some security settings on exchange server but Im not too sure.