Re: Disable SSLVPN webportal page
I am positive that there is no such option to disable the access to the Web GUI(ssl-vpn) alone.
However, you can remove all the widgets removed from the portal, again, I don't think this will solve your problem.
You can try the below:
config vpn ssl settings
set url-obscuration enable
This field is available when sslvpn-enable(under same vpn ssl settings) is set to enable. Enable to encrypt the host name of the url in the display (web address) of the browser for web mode only. This is a requirement for ICSA ssl vpn certification. Also, if enabled, bookmark details are not visible (field is blank.).