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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?

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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 '11 at 20:09
    
I agree, it's like some ports being blocked. –  Matthew Read Jan 10 '11 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 '11 at 22:25

1 Answer 1

up vote 2 down vote accepted

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

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Found this on the google help. Seems like it is ports 5222 and 443. google.com/support/talk/bin/answer.py?hl=en&answer=27930 –  sickgemini Jan 28 '11 at 2:52

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