I connect to company network over VPN and cannot use datalink functions.
what shall we do?
Your VPN has to allow a connection to the PI server over TCP port 5450. Do other PI applications work from the same machine over the same VPN, like ProcessBook or PI-SMT?
No, even the connection cannot be made active.
If you cannot connect to PI from any client applications (PI Datalink, PI ProcessBook, PI-SMT), but you CAN use other applications, such as e-mail, then you need to work with your network people to determine the issue. They may be firewall rules in place blocking access.
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