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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, ...
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.
btw, thanks for bringing this to our attention and I appreciate the details you have provided.