Access the Cisco ASA or ASDM.
I have tried and added the following command and then test:
ssl encryption rc4-sha1 aes128-sha1 aes256-sha1 3des-sha1
Then the problem has been fixed.
I really like the captive portal feature for our guest network. It has nice VLAN features in terms of separating our network. also anti-virus is good, It is easy to use and performs very well.
Ability to set up remote systems is the most valuable feature for Fortinet.