Problem with a ssl vpn from Chrome and Mozilla

Hi, I´ve the apm full webtop portal for access my internal web portal application. I´m using Advanced Resource Asign option in the VPE and I´ve a „Webtops“ configuration with defined Portal Access Start URI pointed to my internal web portal application URL. The Webtop with my internal web portal URL is assigned in the Advanced Resource Assign box. There are linked another applications on the internal web portal application. So if I´m accessing internal web portal from internet through IE, I can access all linked web applications on the internal portal as I´m expecting but if I´m using Chrome or Mozilla as a ssl vpn client for connecting to the described apm full webtop portal, the hostnames of linked applications on the internal web portal (published on the apm full webtop portal) are translated through DNS servers defined on the client´s computers instead of DNS servers in the internal LAN just like in the case if I´m using IE for to establish ssl vpn to the apm. Could You somebody suggest me where is the problem, please? Antonin