We have a cerberus ftp server that we connect to with core ftp client. Everything works fine when we connect to the server from within the LAN using the private IP as the host name.
We then set up a Dynamic DNS account, and forwarded ports 20 and 21 to the cerberus FTP server. Now when we try to login, we get a 530 error. We know that it is not a login/password issue because the only field that we edit is the host name on the core ftp client. The username/password are not touched.
Furthermore, Dynamic DNS and port forwarded seem to be configured correctly because the the ftp logs show a connection. Here are the logs from the ftp server:
Wed Jul 27 11:15:42 2005 28 Incoming connection request on interface 10.0.0.9
Wed Jul 27 11:15:42 2005 28 Connection request accepted from 10.0.0.10
Wed Jul 27 11:15:42 2005 28 USER bh
Wed Jul 27 11:15:47 2005 28 PASS ***********
Wed Jul 27 11:15:47 2005 28 Anonymous user "bh" logged in with password "gbapass"
Wed Jul 27 11:15:47 2005 28 SYST
Wed Jul 27 11:15:47 2005 28 PWD
Wed Jul 27 11:15:47 2005 28 PASV
Wed Jul 27 11:15:47 2005 28 LIST
Wed Jul 27 11:15:47 2005 28 Connection with data socket accepted
Wed Jul 27 11:15:47 2005 28 The data connection was closed by the remote socket
Wed Jul 27 11:16:27 2005 28 QUIT
The log shows that the connection was closed by the client but the error on the client side displays a 530 login error.
Once again this login error is only present when trying to access the ftp server using the dynamic dns name.
-TIA