What are two reasons for this problem?

You have recently deployed a dynamic VPN. Some remote users are complaining that they cannot
authenticate through the SRX device at the corporate network. The SRX device serves as the
tunnel endpoint for the dynamic VPN. What are two reasons for this problem? (Choose two.)

A.
The supported number of users has been exceeded for the applied license.

B.
The users are connecting to the portal using Windows Vista.

C.
The SRX device does not have the required user account definitions.

D.
The SRX device does not have the required access profile definitions.

Explanation:

Reference :https://www.juniper.net/techpubs/en_US/junos12.1/information-products/topiccollections/syslog-messages/index.html?jd0e28566.html
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16477