I've noticed that when I login over WIFI to my company VPN the following problems occur:

  1. GTalk does not login.
  2. No GMail notifications received.
  3. I can access the Android Market but when I attempt to download an application it fails.

All these work ok on my home WIFI and 3G connections. Does anyone have any idea what would cause this? What protocols/ports do these services use and is it possible to edit them?

  • 1
    Ask your company's administrator? They surely should know better than some strangers in the internet if your company blocks some services.
    – Lie Ryan
    Jan 10, 2011 at 20:09
  • I agree, it's like some ports being blocked. Jan 10, 2011 at 20:28
  • Happy to ask them but wasn't sure what to ask. IE: what protocols/ports do these services use? Is it possible to change them? I've updated the question to make this clearer.
    – sickgemini
    Jan 10, 2011 at 22:25

1 Answer 1


I think GTalk uses port 5228, and the notifications and Market downloads both use the GTalk protocol internally.


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