User`s guide

SSL VPN is available at no additional cost for an unlimited amount of users. Depending on the performance level of the appliance model,
Barracuda Networks recommends the following maximum numbers of users:
Model Recommended Max. Users
X100, X101
SSL VPN not available
X200, X201
25 users
X300
50 users
X400
100 users
X600
200 users
Depending on the Firewall and VPN usage of your Barracuda Firewall, the recommended number of maximum users may vary.