Allow particular user to access only one port on particular

[chintank]

I wanted a help to restrict a vpn user only to access certain ports on a server. Please find below the brief of my requirement:
1) I have a vpn server on which we have created new users and given them appropriate permissions.
2) I have an application server created on aws cloud which we connect after connecting to the vpn.
3) We have lot of applications deployed on that server say on port numbers 1000,1100,1200
Now what we want is that a particular user say xyz(added on vpn server) is only dealing with application on port 1000 and we don’t want that user to have access to the applications on other ports. We want help to achieve this so kindly provide us with the steps to perform this activity.

[TinCanTech]

Openvpn does not filter ports .. you must use other means. eg. Firewall.