Setting up a ftp server (NAS working on ftp://192.168.1.66//share) - but on the www? I have a static IP address

sorry can not understand your question
What are you trying to ask

I have set up a NAS which has a ftp feature.

I can acess it locally on my LAN

I need to access it via the web.

Forward Port 21 on your firewall to your LAN IP.  Access your FTP by typing in FTP://publicIPAddress/share

Is that udp or tcp ?  Have I to do both?

TCP

ok I have done like so

ftp   external port     internel port      protocal          ip                  enabled
               80                  21                  21            192.168.1.77        [x]

then I get the usual error:
Windows cannot access the folder ....... make sure you have permission ... and the file name exists.

Is there a cmd line way to check this?

Sorry I typed that wrong - its like so:

ftp   external port     internel port      protocal          ip                     enabled
                     21                  21               tcp            192.168.1.77         [x]
 

You orignal question says the ip of the NAS FTP is 192.168.1.66 so forward to that not 192.168.1.77 otherwise it looks fine.

Getting tired now will try again tomorrow.

I think I know what the issue is but will sleep on it!

ok

Has this been worked out yet?