This may occur when the user used for the FTP configuration does not have SSH access or the SSH service on the FTP appliance is not enabled.
Ensure the the SSH service on the FTP appliance is enabled and started and the user defined is allowed SSH access.
Check if the backup port is configured to Port 22. SDDC Manager backup only functions on Port 22.
Also, To workaround the issue, follow the below mentioned steps:
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Rename the /opt/vmware/vcf/sddc-support/status.json (or status-tmp.json) to something else.
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Restart the SoS rest service - systemctl restart sosrest.service.
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