Swapped an old tp link with the gl.inet marble. Had to open port 25001 for an ftp server. It was working before with the old router. I opened the port on the marble (set port to both wan and lan). The client comnects, but I get a "cannot retrieve directory" error. Put the tplink back and it works. Any suggestions what I am doing wrong?
If you can't cwd does that show before or after it states the user has logged in? IDK what daemon you're using but VS-FTPd won't allow that until one is successfully logged on.
netstat -natp | grep '25001' & uci show firewall | grep '25001' on the Marble.
nmap -p '25001' $WAN_IP_here from anywhere but while on your LAN or...