Why might VPN not connect on Mac OS in the company network?

Question

VPN

From anywhere with any wifi from any USB modem or network I can connect to the VPN. But I can't at work.
What could be the problem. It works with Windows, it works with Linux, it doesn't work with Mac.
Admins can't do anything. Like we don’t fumble in your poppy, put yourself a Windows and don’t give us a brain.
I think that they have something with the Firewall, I don’t know what exactly.
Prompt, knowing people what can be it?

Answer 1

BUT!!! Most likely GRE-packages do not pass, but did not begin to understand for a long time. I got out of the situation simply - through the parallels I installed windows for myself and worked there with ciskovpn. And Windows still lives in parallel, sometimes it is needed for such cases.

Answer 2

What vpn? bring config or settings screen

Answer 3

Customer company Cisco IPSec VPN

Answer 4

What VPN is configured on (cisco catalyst, isa server)? What app are you using to connect to the VPN? My iPad is connected to VPN IPSec running on kerio control appliance, everything works. I connect with the standard built-in ipad VPN CLIENT. Look at the logs when connecting to a VPN.