Skip to content

Register now for our Web Enablement Ecosystem webinar!

  • Contact us: +34 944 58 06 58
  • Plesk Partner Program
  • Plesk Lifecycle Policy
  • Blog
  • Contact us
  • Plesk 360
  • Contact us: +34 944 58 06 58
  • Plesk Partner Program
  • Plesk Lifecycle Policy
  • Blog
  • Contact us
  • Plesk 360
  • Solutions
    By Role
    • Developers
    • Content Managers
    • Digital Agencies
    • IT Admins
    • Web Hosters
    • Hyperscalers
    • Developers
    • Content Managers
    • Digital Agencies
    • IT Admins
    • Web Hosters
    • Hyperscalers
    By Edition
    • Web Admin Edition
    • Web Pro Edition
    • Web Host Edition
    • Business & Collaboration
    • Plesk WP Edition
    • Web Admin Edition
    • Web Pro Edition
    • Web Host Edition
    • Business & Collaboration
    • Plesk WP Edition
    By Cloud
    • Amazon Web Services
    • Microsoft Azure
    • Alibaba Cloud
    • GCP Marketplace
    • Vultr
    • DigitalOcean
    • Linode
    • UpCloud
    • Amazon Web Services
    • Microsoft Azure
    • Alibaba Cloud
    • GCP Marketplace
    • Vultr
    • DigitalOcean
    • Linode
    • UpCloud
    Partner Program
    Exclusive discounts, benefits and exposure to take your business to the next level
    Become a partner
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    Explore Features
    • Everyone
    • Admins & Web Hosters
    • Developers
    • Designers & Agencies
    • Plesk Features
    • Everyone
    • Admins & Web Hosters
    • Developers
    • Designers & Agencies
    • Plesk Features
    Key Topics
    • SocialBee
    • WP Toolkit
    • Sitejet Builder
    • SEO Toolkit
    • Joomla! Toolkit
    • Plesk Premium Email
    • Plesk Email Security
    • SocialBee
    • WP Toolkit
    • Sitejet Builder
    • SEO Toolkit
    • Joomla! Toolkit
    • Plesk Premium Email
    • Plesk Email Security
    Feature Packs
    • Business & Collaboration
    • WP Pack
    • Hosting Pack
    • Power Pack
    • Language Pack
    • Business & Collaboration
    • WP Pack
    • Hosting Pack
    • Power Pack
    • Language Pack
    Featured Extension
    SocialBee
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • Extension
  • Pricing
  • Extensions
  • Help Center
  • More
    • Careers
    • Events
    • Plesk University
  • FREE TRIAL
  • Solutions
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder
      • SEO Toolkit
      • Joomla! Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • SocialBee
  • Pricing
  • Extensions
  • Help center
  • More
    • Careers
    • Events
    • Plesk University
    • Blog
    • Plesk Partner Program
    • Contact Us
  • FREE TRIAL
  • Solutions
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder
      • SEO Toolkit
      • Joomla! Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • SocialBee
  • Pricing
  • Extensions
  • Help center
  • More
    • Careers
    • Events
    • Plesk University
    • Blog
    • Plesk Partner Program
    • Contact Us
  • FREE TRIAL

Knowledge Base

Can’t back up Plesk with Acronis Backup: version `GLIBCXX_3.4.26′ not found

 
acronisacronis backupacronis backup extensionapplications extensionsbackup

Symptoms

  • 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)

  • 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

Update the Acronis Agent (Recommended)
Manual Workaround

   

   

  1. Log in to Plesk

  2. Open Acronis Backup > Go to backup console (it may ask for credentials)

  3. Go to Settings > Agents in the Acronis Backup console

  4. Select the machines with an outdated agent. They're marked with an orange exclamation mark.

    Note: The machines must be online.

  5. 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:

2.png

   

   

   

  1. Connect to the Plesk server over SSH

  2. Edit /usr/lib/Acronis/BackupAndRecovery/webcpprecapture

    # vi /usr/lib/Acronis/BackupAndRecovery/webcpprecapture

  3. Add the following lines:

    unset LD_LIBRARY_PATH
    unset LD_PRELOAD

  4. Save the changes

If the Acronis agent is on version 28323 (can be checked in Acronis console), follow these steps too:

  1. Connect to the Plesk server over SSH

  2. Download the patched libwebcp_agent.so

    # wget https://plesk.zendesk.com/hc/article_attachments/12376927359895/libwebcp_agent.so

  3. Rename the original file:

    # mv /usr/lib/Acronis/BackupAndRecovery/libwebcp_agent.so{,.backup}

  4. Move the downloaded file to the Acronis directory:

    # mv libwebcp_agent.so /usr/lib/Acronis/BackupAndRecovery

  5. Restart the Acronis service:

    # service acronis_mms restart

  6. 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),

   

Tweet
Share
Share
Email
0 Shares
Read the full article
Related Posts

You Are Always Safe When You Have an Up-To-Date Plesk Backup

Read More »

The Plesk HoliDeals Calendar is here (Part 2)

Read More »

Get Your Hands on Plesk Extensions and Toolkits This ‘HoliDeals’ Season (Part 1)

Read More »
Knowledge Base

Some operations in Acronis Backup extension in Plesk fail: Declaration of Modules_AcronisBackup_OperationsListAdapter::count() must be compatible with CommonPanel_View_List_Paginator_Array::count(): int

Read More »

Creating backup in Acronis Backup extension in Plesk fails: The SnapAPI kernel module is not loaded for the kernel

Read More »

Unable to access Acronis Backup extension in Plesk: An error has occurred. Please try again later or contact support

Read More »

 An operation fails in Plesk: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry ‘X’ for key ‘PRIMARY’

Read More »

Hosting Wiki

  • Django
  • RESTful Web Service
  • Server Redundancy
  • Cloud Service Architecture
  • Virtualizor
  • On-Demand Services
  • Google Cloud CDN
  • AMP
  • Bare Metal Server
  • Backup
  • Denial of Service
  • Red Hat Virtualization
  • Virtuozzo
  • Oracle VM Server
  • Citrix Hypervisor
  • Server Virtualization Software
  • Windows Server
  • Linux
  • Virtualization
  • MongoDB
  • VirtualMin
  • Plesk
  • Web Server
  • DNS Server
  • SSH
  • Email Virus Protection
  • HTTP

Industry
Partners

industry-partner_ALIBABA
industry-partner_GOOGLEPARTNER
industry-partner_MICROSOFT
industry-partner_REDHAT-r2
industry-partner_ALIBABA
industry-partner_AUTOMATTIC
industry-partner_AWS
industry-partner_DIGITALOCEAN
industry-partner_SCALEWAY
Follow us:
Facebook Twitter Linkedin Youtube Github

COMPANY

About Plesk
Our Brand
Legal
Careers
Impressum

PRODUCT

Pricing 
Extensions
What’s new

KNOWLEDGE BASE

Documentation
Help Center
Migrate to Plesk
Contact Us
Hosting Wiki
Preview releases

PROGRAMS

Contributor Program NEW
Partner Program
Affiliate ProgramNEW

COMMUNITY

Blog
Forums 
Plesk University

First defaul

Company

About Plesk
Our Brand
Legal
Careers
Impressum

PRODUCT

Pricing 
Extensions
What’s new

KNOWLEDGE BASE​

Documentation
Help Center
Migrate to Plesk
Contact Us
Hosting Wiki
Preview releases

PROGRAMS​

Contributor Program NEW
Partner Program
Affiliate ProgramNEW

COMMUNITY​

Blog
Forums
Plesk University

Follow us:
Facebook Twitter Linkedin Youtube Github

© 2025 WebPros International GmbH. All rights reserved. Plesk and the Plesk logo are trademarks of WebPros International GmbH.

Managed with love with Plesk WP Toolkit