This issue started several month back with one of my clients and their Verizon Android and iPhone devices. The devices will work fine on with ActiveSync for 10-30 minutes, then the devices will not get push email nor updates to contacts/calendar. I can't even add an exchange account on a phone connected to Verizon's network (Wi-Fi off), it fails to find the server at all.
Devices on AT&T, T-Mobile and even an Android VM on a Comcast connection work perfectly fine. Verizon's network team looked at the issue and has determined that they're network is fine and is blaming my client's server. The server passes Exchange Connectivity Analyzer and as mentioned, works perfectly fine on other providers networks.
Verizon refuses to look at the issue any further. I think Verizon's network is to blame as evidenced by the other providers working perfect.
Am I missing something here? It can't possibly be that Verizon needs some special setting in Exchange or something.
Thanks!