Here says ASA 5505 can have 25 clients
In Configuration -> Remote Access -> Advanced -> Maximum SSL VPN Sessions , i type 10 and an erro popsup the maximum sessions must be between 1 and 2 .
Any thoughts ?
Yes there is a way to increase the number of clients but you just can't type a number in. Check out near the bottom of this link for the part numbers to order.
Here is the Ordering Guide for AnyConnect:
I hope you will find the information you need in it.