ISPConfig was installed on the first webserver (WEB1) using the standard install. I have an IP address assigned to the crossover NIC on WEB1 as 192.168.0.202. I then installed ISPConfig on the second webserver (WEB2) using the expert install. I kept getting stopped where it asks for the master MYsql server name. When I used localhost, which is what I used in WEB1, it finished the install. I can get to both interfaces locally.
Localhost is always the local server, so you now have to independant servers. As you installed the second server you must use the real hostname of the master server and not localhost. You will have to uninstall ispconfig on the second server and then reinstall it again as your current server can not be joined to the master after the installation.