IIS ftp server can't access from other machine

https://serverfault.com/questions/438314/iis-ftp-server-works-locally-but-cannot-connect-from-remote

Basically, you have to run:

sc sidtype ftpsvc unrestricted

And then restart the FTP service:

net stop ftpsvc & net start ftpsvc

From what I can tell, it's a bug in R2. Go figure.