I think I have discovered a firmware issue with R1805
Navigating to Setup\Network Services\Ftp Server
There are no issues with the FTP Server menu, it displays the options Off and On.
However, after selection the 'On' option, the user needs to navigate to the User Name and Passwords Tabs.
Unfortunately with my X10 R1805 this erroneously opens the 'Music Db Recovery' page, hence there is no way to add the User Name or Password

I have never actually used the FTP Server option but I think if the software writers read these posts then they should urgently fix what appears to be a completely broken FTP Server configuration and release an updated firmware version.