Comments
 

Currently, it is not possible to configure the DNS suffix (search domain) for SSL VPN and IPSEC tunnels through the GUI, but it can be configured using the CLI.

For SSLVPN:

config vpn ssl settings
set dns-suffix example.com example.org
end

For IPSEC:

config vpn ipsec phase1-interface
set domain example.com
end

Changes are effective immediately. After configuring the setting, users will be able to resolve names using single names instead of FQDN.