I was able to have this new test server join my multiserver setup at my other location but I am unable to do any thing with it. It seems that my master can't connect to the slave. But the slave connected to it during setup.
The master does not have to connect to the slave as the slave is the one that syncs the data, so the slave connects to the master. Your probem is most likely that the slave can not connect to the master with its ispcsrv user, that happens when the /etc/hosts files on master and slave are not configured as decsribed in the multiserver tutorial. A working dns configuration is not sufficient, the /etc/hosts files on master and slave have to conatin the fully qualified domain name of master and slave and only the fully qualified domain, nothing more. After that is fixed, ispconfig has to be uninstalled and reinstalled on the slave.