I've an SA520 with WAN IP Address 192.168.192.175 connected to private LAN of ADSL Router.
ADSL Router has a public ip address (like 84.73.x.y).
ADSL Router routes all traffic to SA520 WAN Port.
I've configured SSLVPN on SA520. The server portal URL is automatically setted to https://192.168.192.175/portal/sslvpn and i can't change it.
Users access SSLVPN portal on URL http://84.73.x.y/portal/sslvpn (i.e. the pubblic ip address of ADSL Router). They can access to login page but they can't permorfe login.
I found that after an user click login button on SSL portal login page, browser try to request a page pointing to wrong url http://192.168.192.175 (i.e. the address of SA520 on network between SA520 e ADSL Router).