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We have a user on the corporate network who wants to connect to an SFTP server on an external network. He is using Filezilla to initiate the connection. To access this server he must pass through a proxy server and a firewall.

He can only connect to the SFTP server when he is using the corporate WiFi and corporate VPN, but he cannot connect to this server using the network point at his desk. The error log is listed below.

Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: open "*************@104.41.224.191" 8922 Error: Connection timed out after 20 seconds of inactivity Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: open "*************@104.41.224.191" 8922 Error: Connection attempt interrupted by user Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "http://sutm01.woolworths.co.za" 8080 "WOOLWORTHS\W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: ssh_init: Proxy error: Unable to resolve proxy host name Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "http://sutm01.woolworths.co.za" 8080 "WOOLWORTHS\W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: ssh_init: Proxy error: Unable to resolve proxy host name Error: Could not connect to server Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "sutm01.woolworths.co.za" 8080 "WOOLWORTHS\W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "sutm01.woolworths.co.za" 8080 "WOOLWORTHS\W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Disconnected from server Status: Delaying connection for 5 seconds due to previously failed connection attempt... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "sutm01.woolworths.co.za" 8080 "WOOLWORTHS\W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Error: Connection attempt interrupted by user Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 "W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 "W7085385" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 3 "10.254.0.10" 8080 "W7085385" "*********" Error: Unknown proxy type Error: Could not connect to server Status: Waiting to retry... Error: Connection attempt interrupted by user Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 "w7110896" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 "w7110896" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Disconnected from server Status: Connecting to 104.41.224.191:8922... Response: fzSftp started, protocol_version=8 Command: proxy 1 "10.254.0.10" 8080 "w7110896@woolworths.co.za" "*********" Command: open "*************@104.41.224.191" 8922 Error: Network error: Software caused connection abort Error: Could not connect to server Status: Waiting to retry... Error: Connection attempt interrupted by user

Why is the connection being refused?

  • Issues with corporate IT are off-topic on Super User. Even the solution you present is not universal. – Daniel B Apr 4 at 14:05
  • If I may plead my case, I feel like this post would help people who are having connection issues with SFTP over a network with a proxy and active directory. There is very little coverage of this on the internet. – Caine Kiewit Apr 4 at 14:15
  • I'm not sure where to move this question, but i suppose network engineering would be a better fit? – Caine Kiewit Apr 4 at 14:20
  • There is no Stack Exchange website where this type of question would be on-topic. It’s not like it’ll be removed now. // In your solution, you use a HTTP proxy. It is actually quite unusual that these are set up to allow connections to port 22. – Daniel B Apr 4 at 15:29
  • I forgot to mention all connections to the external network must go through the proxy(UTM in this case), so this solution should work in those kinds of environments. – Caine Kiewit Apr 5 at 7:55
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  1. Locate the generic proxy setting configuration window,
  2. Click the radio button for an HTTP1.1/Connect proxy
  3. Enter the proxy socket for the proxy server on the LAN,
  4. Enter the user’s proxy authentication username and password.

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