I did that and I can access up to 8 servers too. The thing is I am using three servers, (two others plus iptvprivateserver).
My problem: Before activating the multiple portals, I could switch from one portal/server from any particular server, by pressing RELOAD PORTAL, then I will see an option to load the embeded server or load the other two servers. So if I am in the IKS server, and I press the settings and chose RELOAD PORTAL, and then OK at the prompt if I want to restart portal, I will see the four things. EMBEDDED PORTAL, THE TWO PORTALS I CONFIGURED, & SYSTEMS SETTINGS. However when multiple server is activated, and restart the portal, the DEFAULT portal is loaded automatically. But should I chose to steam from another server and select the RELOAD PORTAL from within that server, it will ONLY load back the server that is configured as the default server. So if IKS is in portal 2 and another server in portal 1 is the default server, I cannot access IKS, and the same if I switch IKS that is still in portal 2 as the default, then I can only access IKS because it is the default server.
So my question to you is? Do you have more than one servers activated (F1) and if so, how do you move from one to the other?