Make sure the VPN pool is among the allowed addressed for management (ssh and http / ASDM) via the inside interface (using whatever nameif you have set)..
Also, make sure you configure:
management-access <interface-name>
More details can be found here: http://www.cisco.com/c/en/us/support/docs/security/adaptive-security-device-manager/118092-configure-asa-00.html