AT&T as service provider

[Christopher Woods]

> -----Original Message-----
> From: vnc-list-bounces at realvnc.com 
> [mailto:vnc-list-bounces at realvnc.com] On Behalf Of Nancy
> Sent: 17 December 2009 15:44
> To: vnc-list at realvnc.com
> Subject: AT&T as service provider
> 
> My iPhone will not access my VNC server whenever AT&T is the 
> ISP for the iPhone.  The iPhone will, however, access the 
> server when connected by Wifi to an ISP other than AT&T.  Any 
> suggestions as to why this is happening or how to get around it?


This sounds like a classic case of AT&T blocking traffic on the ports
required for VNC (5800,5900). I'd suggest you open a terminal window and try
telnetting into the port manually, but you can't do that on non-jailbroken
iPhones :) Can you tether a laptop to the iPhone and use its data connection
to test?

Alternatively, contacting AT&T customer support and enquiring as to whether
the ports are blocked or not may yield an answer, although they may know
less than us! I would expect all non-standard ports to be blocked by default
on most data packages unless you pay more for a premium data package.

C