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There are different ways to configure RDP scaling inside FortiOS:
1) Under the SSL VPN web portal:
# config vpn ssl web portal
edit "RDP_Portal"
set tunnel-mode enable
set web-mode enable
set ip-pools "SSLVPN_TUNNEL_ADDR1"
# config bookmark-group
edit "gui-bookmarks"
# config bookmarks
edit "RDP"
set apptype rdp
set host "192.168.1.1"
set port 3389
set width (0-65535, default = 0)
set height (0-65535, default = 0)
next
end
2) Under Personal or User group bookmarks:
# conf vpn ssl web [user-group-bookmark | user-bookmark]
edit "fortinet#"
# config bookmarks
edit "RDP-BOOKMARK"
set apptype rdp
set host "10.10.10.10"
set port 3389
set width (0-65535, default = 0)
set height (0-65535, default = 0)
next
end
3) Under the SSL-VPN web portal:
edit "RDP_Portal"
set tunnel-mode enable
set web-mode enable
set ip-pools "SSLVPN_TUNNEL_ADDR1"
set default-window-width 0 (default 1024)
set default-window-height 0 (default 768)
end
It is necessary to have web-mode enabled on the portal to see the 'default-window' settings.
To achieve full screen when using RDP, these settings and the bookmark settings must be set to 0 as explained in scenario 3 which will scale with a full-screen browser window.
There are three factors which decide the final outcome of how RDP will scale:
1) If width & height settings under bookmark are non zero values, then these values will be used.
2) If width & height settings under bookmark are zero and width/height settings under portal are not zero, then FortiOS will use the setting configured under the portal.
3) If width & height settings are zero under both bookmark and portal, then RDP will auto-scale based on individual users' browser's window size.
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