End users can't access local network when VPN connected to us.

[CPnoob]

I have users using Capsule on Android Smartphones and tablet, they can connect to vpn gateway but they cannot use Remote Desktop to access terminal server.

Windows users using Endpoint Connect have no problem connecting and using Remote Desktop to access terminal server.

What to do? Where do I start looking?

[PhoneBoy]

Just to clarify, Android users can't use an RDP client to connect to a system on their local network when connected to the VPN?

[Nick_Doropoulos]

You could start by looking at the ATRG Guide for Workspace Capsule (sk108955). The "Troubleshooting Capsule Workspace for Android" section seems to be the most relevant for your problem.