Passive mode FTP file download hangs from specific machine
- by chiptuned
I have a server which is an AWS instance that just cannot download files from a specific FTP server. I can connect to the FTP server fine and run some commands, but when I request a file it just hangs. Here is the debug output of the base linux ftp client after login:
---> SYST
215 UNIX Type: Apache FtpServer
Remote system type is UNIX.
ftp> get outgoing/catalog.gz catalog.gz
local: catalog.gz remote: outgoing/catalog.gz
---> PASV
227 Entering Passive Mode (64,156,167,125,135,191)
---> RETR outgoing/catalog.gz
150 File status okay; about to open data connection.
Thats it. Then it just sits there and nothing transfers. I have verified that a data connection is made but the client gets no data.
? ss -nt dst 64.156.167.125
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB 0 0 10.185.147.150:41190 64.156.167.125:21
ESTAB 0 0 10.185.147.150:48871 64.156.167.125:48557
The FTP server is not in my control and downloads from other FTP servers in passive mode have worked. Active mode does not work as the system is behind a firewall. Every FTP client I've tried has the same problem. The download works from other systems, even from other AWS instances I have with the same Security Group. Not necessarily the same distro or config though.
I understand it may be some issue on the server side, but I want to know what it is about my particular machine where the transfer hangs and where on every other machine I can get my hands on, it works. Please let me know what the culprit on the client side could be or ideas on what else to look at.
