Unable to access SFTP server error when configuring a backup for Cisco Unified CCX 10.6.1

I was having a lot of problems today moving the SFTP backup target for a Cisco Unified CCX system. It was pointing at an old Linux server which was being decommissioned and I needed to point it at a new server so I assumed it would be a simple matter of creating a new device with the new host name. Nope.

I kept on receiving the error Update failed : Unable to access SFTP server. Please ensure the username and password are correct. when trying to save the new configuration.

I knew the new target server and credentials I was using were OK as the other Cisco Unified components (Call Manager, Unity, IM and P) had all been backing up to it for weeks.

To cut a long story short (and it took a bloody long time to work this out!), the problem was with the ciphers that were being made available by the SSHD service on the new Linux server. It appears that the version of UCCX we are running requires a different cipher to be available than the other Unified components.

The fix was simple, I had to fire up VI on the new Linux server and edit the sshd config at /etc/ssh/sshd_config

The allowed ciphers had been set to Ciphers aes128-ctr,aes192-ctr,aes256-ctr

I needed to add aes128-cbc to this list.

Save, restart sshd service.

Now when I went to save my new backup device in UCCX it worked perfectly!

 

2 Comments on "Unable to access SFTP server error when configuring a backup for Cisco Unified CCX 10.6.1"


  1. Hello, I have the same problem but for a windows server. Any idea how this could be fixed?
    Thank you!

    Reply

    1. Hi Andrew

      The exact details would depend on what SFTP server software you are running on Windows however the principal is the same, you need to make sure you have the server configured with a compatible cipher (AES128-CBC)

      Regards

      Kirin

      Reply

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