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652 posts

Ultimate Geek
+1 received by user: 163

# 208516 15-Feb-2017 13:55
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I have a bunch of Linux servers on a local LAN that need to individually access a SFTP servers out on the internet. However 'company policy' stats that the server must connect via a single proxy server for access control reasons. The configuration of the servers can't change without weeks/months of delays. 


Currently there is a Squid Proxy server is handling the HTTP/HTTPS traffic but it can't handle the SSH/SCP/SFTP traffic.


I've tried using ssh -N -D to act as a proxy between the Internet and the LAN


but I get the following error:


channel 1: open failed: administratively prohibited: open failed


What is a known working solution to my problem?





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3451 posts

Uber Geek
+1 received by user: 451


  # 1720653 15-Feb-2017 14:08
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Maybe setup a "relay" server (VPS, AWS etc.) that you can tunnel to on HTTPS and then make SFTP connections out from there?

14761 posts

Uber Geek
+1 received by user: 2746


  # 1720655 15-Feb-2017 14:18
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Looks to me like you have two conflicting things:


  • Policy that you must use proxy server A
  • Proxy server A does not support SFTP

Either the policy changes or the proxy server changes.


652 posts

Ultimate Geek
+1 received by user: 163

  # 1720708 15-Feb-2017 15:57
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I believe I have come up with a working solution and that was to use Srelay. It's a simple lightweight program which acts as a SOCKS proxy server.  This can be installed on the same server as the Squid Proxy server but just listening on different port number.



14761 posts

Uber Geek
+1 received by user: 2746


  # 1720726 15-Feb-2017 16:19
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Ah, so you basically removed that limitation. Something had to give there.

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