501 PORT address does not match originator

Hi,

I get that error trying to copy from one ftp to another, which I already did in the past from both same ftp, and the copy doesn't start.

"501 PORT address does not match originator."

I can see the error in the log view of both ftp windows.

What is this ?

Thanks

They don't allow FXP maybe they have changed the ftp server.