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I wanted to establish a RDC from my Windows 7 machine to a remote server (Server version: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4).

I followed and adapted the instructions from: http://laptops.eng.uci.edu/software-installation/using-linux/how-to-configure-xming-putty

Now my RDC works perfectly, but I get the following error log when I try connecting with Putty:

2018-05-08 14:58:00 Connecting to 192.168.20.209 port 22

2018-05-08 14:58:00 We claim version: SSH-2.0-PuTTY_Release_0.70

2018-05-08 14:58:00 Server version: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4

2018-05-08 14:58:00 Using SSH protocol version 2

2018-05-08 14:58:00 Network error: Software caused connection abort

I cannot connect for sftp transfers with FileZilla, which is actually my main problem since I can connect to my server using RDC

15:33:34 Response: fzSftp started, protocol_version=8

15:33:34 Error: Network error: Software caused connection abort

15:33:34 Error: Could not connect to server

Any idea how to debug this weird situation ?

Thank you !

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The problem came from the fact that the keys generated on the first connection to the server were somehow not stored in HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys. This is probably due to the RDC connection since it happened after I used it.

Following this guide https://www.cyberciti.biz/faq/howto-regenerate-openssh-host-keys/, I removed the old keys from the server and reconfigured Openssh server. While connecting to the server using Putty, the keys were shared and now Putty, RDC and Filezilla all work.

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Reconfig your OpenSSH Server configuration using command sudo dpkg-reconfigure openssh-server

  • 3
    How is this supposed to help? What do you expect this to do? – Sven May 8 '18 at 8:13
  • This solution actually worked. – clementjt May 10 '18 at 3:21

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