NSX SFTP backup fails with error code 29115

Products

• VMware NSX

Issue/Introduction

When attempting a backup on a new SFTP server, the backup fails with the below error:

Error: Authentication failed on fileserver sftp://<ip-address>:22/<file_path>/cluster-node-backups/<NSX_version>-IPv4-<node_UUID>-<node-ip-address>. (Error code: 29115)

There is sufficient space on the SFTP server.

There has been no known storage interruption on the SFTP server; see Authentication failed on the fileserver for SFTP backups on NSX Manager UI: Error code: 29115

The SFTP server is not a Windows server; see "Authentication failed", "bad directory" or "server disk full" error when preforming NSX backup to Windows SFTP server

Cause

The NSX Manager has not yet been able to fully authenticate to the new SFTP server.

Resolution

1. SSH to an NSX manager node as root and run the following to start an SFTP session to the server with the correct backup username and SFTP server FQDN/IP:
   • sftp backup_user@sftp_server
2. You may see an SSH fingerprint and be asked to confirm the connection; validate the fingerprint displayed matches the fingerprint in the backup configuration itself by clicking "Edit" next to the SFTP server in the NSX UI.
3. Once connection is established, retry the backup in the NSX UI.

Additional Information

See Configure Backups for more information.