When and why did ftp break in some browsers?

[Thomas Okken]

I remember at least one ftp site, back in the day, that told me "Your ftp client doesn't close its connections. Go away." when I tried to connect to it using Netscape Navigator. I guess that is an inevitable issue when you're using a stateless client to connect to a stateful server. But the issue became moot before too long as everyone started to expose their anonymous ftp areas to their web servers...