My Zentyal has the ip "192.168.0.1" (internal) and ip "200200200200"(external).
Inside my network I open I open using Internet Explorer or through Windows Explorer address
ftp://192.168.0.1/ ftp://200.200.200.200/ but if I type it in error.
However this error is only displayed by Internet Explorer and Windows Explorer, if you try with Firefox, Chrome, FileZila FTP, they open.
But 90% of customers use IE, and is giving error.
I tried to uninstall and redo the Zentyal, but continues with the problem.
If a retake isntalação new Zentyal, it works, but then he simply (do not know if it's some update that hinders)