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Solved
Cannot connect to FTP server with C3700-100NA but CAN with WNR2000v4
Cannot connect to FTP server from one computer…. but can from another using same credentials.
Only difference between the two PC’s is they are on different routers in different locations, same ISP, same FileZilla version.
What could possibly be causing this behavior?
The Server is ProFTPd on an Ubuntu instance on AWS EC2 with Passive mode enabled.
Both PC’s are Windows 10
Router settings are virtually identical between the two.
PC 1 that can connect.
Router: Netgear WNR2000v4 (V1.0.0.60) with separate cable modem.
FileZilla log
Status: Connecting to xx.xx.xx.150:21...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing...
Status: Server sent passive reply with unroutable address. Using server address instead.
Status: Directory listing of "/" successful
PC 2 that cannot connect
Router: C3700-100NAS (V2.02.06) modem/router combo
FileZilla log
Status: Connecting to xx.xx.xx.150:21...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing
Just FYI….
Filezilla log when connecting PC 2 to a windows ftp server.
Status: Connecting to xx.xx.xx.180:21...
Status: Connection established, waiting for welcome message...
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Status: Logged in
Status: Retrieving directory listing...
Status: Calculating timezone offset of server...
Status: Timezone offset of server is -28800 seconds.
Status: Directory listing of "/" successful
Here is what I found was the problem and how I fixed it.
My FTP server is hosted on Amazon EC2 and set to use Passive mode. The server has a 'real' IP address, and a 'elastic' public IP address using NAT. It would appear that the C3700 has difficulty with the server responses and fails. The WNR2000 is smart enough to deal with the buggy response and succeeds.
The fix was to add MasqueradeAddress [elastic public IP address] to the proftpd config, and all is well.
4 Replies
Can you try another service like ssh and see if that works or fails like the FTP? I have a C3000 that is doing the same thing.
Thank you
Dave
can you please check with PASSIVE mode disabled in the client and AWS on the PC having problem (looks like client config could be causing issue)?
we will get this checked on our side as well.
btw, thanks for bringing this to our attention and I appreciate the details you have provided.
Here is what I found was the problem and how I fixed it.
My FTP server is hosted on Amazon EC2 and set to use Passive mode. The server has a 'real' IP address, and a 'elastic' public IP address using NAT. It would appear that the C3700 has difficulty with the server responses and fails. The WNR2000 is smart enough to deal with the buggy response and succeeds.
The fix was to add MasqueradeAddress [elastic public IP address] to the proftpd config, and all is well.
