70243: Acronis Cyber Protect 15: Backup fails with "Connection to the storage node failed"

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Last update: 09-03-2022


Backup to a managed location fails with:

Connection to the storage node failed. Backup to storage node is not supported by earlier agent versions. Update your Cyber Protection agent to build 26172 or later


Starting from Acronis Cyber Protect 15 Update 4, Storage Node can only accept connections from Agents with build 26172 or later.

Connections from Acronis Cyber Backup 12.5 Agents and pre-26172 Acronis Cyber Protect 15 agents are not accepted, since older agent versions do not support the more advanced connection technology used in newer versions of Storage Node.


Update Agent on the machine to build 26172 or later.

If Acronis Management Server is installed in Windows, you can update agents remotely:

1. Click Settings > Agents.

The software displays the list of machines. The machines with outdated agent versions are marked with an orange exclamation mark.

2. Select the machines that you want to update the agents on. The machines must be online.

3. Click Update agent.

For more detailed instructions see Acronis Cyber Protect: updating to the latest build