Why can't I establish a VPN connection using my iPhone 4's personal hotspot?

Hello everybody,
I want to access our company's network with my Mac Book Pro using my iPhone 4's 3G connection, but unfortunately it simply won't work. Here is what I can do:
- I can establish a VPN connection from my MacBook Pro using my home (or some other) WiFi and access the company network.
- I can establish a VPN connection on my iPhone 4 using 3G and access the company network on my iPhone 4.
- I can use my iPhone 4's personal hotspot (sharing its 3G connection) with my MacBook Pro and surf the Web.
what I can't do is:
- establish a VPN connection on my MacBook Pro when connected to the internet via the iPhone's personal hotspot. (connection times out)
- access the company's network on my MacBook Pro using the personal hotspot, when the iPhone's VPN connection is ON.
The VPN is an encrypted PPTP connection, with username and password.
Is this a known issue, and, if so, is there any way to solve this?
Thanks in advance!
Cheers
Diego

what i forgot:
i'm connecting to the iPhone's hotspot using WiFi
and:
the answer provided here did not do the trick for me :/
https://discussions.apple.com/message/17729456#17729456

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Why can't I establish a VPN connection using my iPhone 4's personal hotspot?

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