DRF Backup or Restore Failure CUCM or CUC

DRF Backup or Restore Failure CUCM or CUC

You may at times receive an error “109-Unable to transfer the tar file over SFTP channel as currently configured SFTP server does not support output stream” while taking Backup or Restore in Cisco Unified Communication Manager or Cisco Unity Connection. If so, refer to the below recommendations.

  1. Ensure that you are using a good SFTP application like Titan or Cygwin while works great as a SFTP Application.
  2. Ensure that there are no network issues between the SFTP Server and Cisco Unified Communication Manager/Cisco Unity Connection.  If there are any network issues which is not fixed, the error will be seen again and again.
  3. If there are no network issues between SFTP Server and CUCM/CUC and you are also using an application like Titan or Cygwin then, re-run the backup/restore whenever fails. Sometimes re-running the backup/restore may succeed if it was an intermittent issue earlier.

Hope this helps!!

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2 Responses

  1. Claudio Quiroz Cabello says:

    Most of the certificates used in CUCM after a fresh installation are self-signed certificates issued, by default, for five years. It is critical for good functionality of the system to have all certificates updated across the CUCM cluster. If your certificates are expired or invalid they might significantly affect normal functionality of the system:
    Disaster Recovery System (DRS)/Disaster Recovery Framework (DRF) might not function properly.

  2. MARK THOMAS says:

    It appears that this issue has been going on at least since 2016. I am a Linux admin and troubleshooting the issue on the SFTP server side. I am using OpenSSH. any updates are appreciated.(CISCO is engaged on customer side but no feedback from them, not yet at least).

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