Symptoms
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After updating Plesk Obsidian to version 18.0.40, Acronis backup fails with the following error:
Failed to execute command '/usr/lib/Acronis/BackupAndRecovery/webcpprecapture: /usr/bin/sw-engine: /usr/lib/Acronis/system_libs/8.2.1/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /usr/bin/sw-engine)
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Acronis console shows the following error message:
Cannot protect a device with assigned quota
Protection plan 'webcp' has been revoked from 'server.example.com' due to a licensing issue.
Cause
A bug in the Acronis agent that has been fixed in version 15.0 28610.
Resolution
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Log in to Plesk
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Open Acronis Backup > Go to backup console (it may ask for credentials)
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Go to Settings > Agents in the Acronis Backup console
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Select the machines with an outdated agent. They're marked with an orange exclamation mark.
Note: The machines must be online.
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Click Update agent
Make sure all previously configured directives are set: 69808: Acronis Backup extension for Plesk: Backup fails after Plesk update to version 18.0.40:
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Connect to the Plesk server over SSH
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Edit
/usr/lib/Acronis/BackupAndRecovery/webcpprecapture# vi /usr/lib/Acronis/BackupAndRecovery/webcpprecapture
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Add the following lines:
unset LD_LIBRARY_PATH
unset LD_PRELOAD -
Save the changes
If the Acronis agent is on version 28323 (can be checked in Acronis console), follow these steps too:
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Connect to the Plesk server over SSH
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Download the patched
libwebcp_agent.so# wget https://plesk.zendesk.com/hc/article_attachments/12376927359895/libwebcp_agent.so
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Rename the original file:
# mv /usr/lib/Acronis/BackupAndRecovery/libwebcp_agent.so{,.backup}
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Move the downloaded file to the Acronis directory:
# mv libwebcp_agent.so /usr/lib/Acronis/BackupAndRecovery
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Restart the Acronis service:
# service acronis_mms restart
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Verify that Plesk is detected:
Note: It make take a couple of minutes to take effect.
# acropsh -m dmldump -s mms -vs InstanceManagement::Instance | grep InstalledApplication
('.Parameters.InstalledApplication', 'item_string', 'Plesk'),
('.Parameters.InstalledApplication^Searchable', 'nil', None),