Draytek Vigor 3200 Series User Manual page 306

Disable – the profile will be inactive. If you choose Disable,
all the web proxy profile appeared under VPN remote dial-in
web page will disappear.
Secured Port Redirection – such technique applies private
port mapping to random WAN port. There are two
restrictions for proxy web server for such selection: 1) it is
only used for WAN to LAN access, the web server must be
configured behind vigor router; 2) web server gateway must
be indicated to vigor router. In addition, users must execute
"Connect" manually in SSL Client Portal page.
SSL – if you choose such selection, web proxy over SSL will
be applied for VPN.
After finishing all the settings here, please click OK to save the configuration.
Vigor3200 Series User's Guide 296