0
1
I have a Cloud app - SecureGatway firewall - zOS architecure. I'm on the client side. I can open an FTP control connection between the client and the server with the client script (PHP) but the data connection fails. I can also change settings on the firewall (secure gateway) so I have more control than the client script.
I have read some articles and questions here so I understand that there is passive and active mode and control and data channel. Example: FTP Connection Modes (Active vs. Passive)
I also read that the router might be failing to acquire the two connections (FTP control and data). Is there a workaround that I can implement on the client side to make this association or whatever? I can run FTP commands on server side example.. Maybe that could help?
Edited based on comments: - I tried passive mode ftp_pasv () - it resulted to timeout - OS: app server runs on: 14.04.1-Ubuntu. Connecting to zOS/MVS
Andr
Posted 2019-03-14T09:08:16.877
Reputation: 1
Have you tried PASV mode and what were the results. Also, what FTP client and OS are you using so we can identify the specific commands needed. – Hogstrom – 2019-03-14T12:15:01.043
If both sides are behind some firewall or NAT as it might be the case here (not fully clear, but common for cloud setups on one side and company/private internet access on the other) there is likely no workaround, i.e. the firewall/NAT on at least one side must be able to explicitly deal with FTP instead of just forwarding data. FTP is always a trouble when NAT/firewalls are involved, better use protocols like sftp (SSH based) which don't have this problem. – Steffen Ullrich – 2019-03-14T14:54:17.143