Installing Plesk updates fails due to failed authorization on Imunify360 repositories: [Errno 14] HTTP Error 401 – Unauthorized

Symptoms

Note: The article is applicable only to RHEL-based operating systems (CentOS, RHEL, CloudLinux).

• On a Plesk server with Imunify360 installed, the installation of Plesk updates fails:

  imunify360 | 2.7 kB 00:00
  
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized
  
  Trying other mirror.
  Failed to install [email protected]_64:
  Error while downloading packages metainfo: failure: repodata/repomd.xml from imunify360-alt-php: [Errno 256] No more mirrors to try.
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized. Trying again. 
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized
  Trying other mirror.
  Failed to install [email protected]_64:
  Error while downloading packages metainfo: failure: repodata/repomd.xml from imunify360-alt-php: [Errno 256] No more mirrors to try.
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized. Trying again.
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized
  Trying other mirror.
  Failed to install [email protected]_64:
  Number of retries is exceeded.
  NoMoreMirrorsRepoError: failure: repodata/repomd.xml from imunify360-alt-php: [Errno 256] No more mirrors to try.
  http://SSt9QxPt7aJMo3xN:[email protected]/centos/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 401 - Unauthorized
  
  ERROR: The Yum utility failed to install the required packages.
  Attention! Your software might be inoperable.
  Please contact product technical support.

  ---

  failure: repodata/repomd.xml from imunify360-alt-php: [Errno 256] No more mirrors to try.
  http://repo.alt.cloudlinux.com/el/U1M5cFBzEZjMMeZfsTyUZK1iReLz5AsXrJVQ_4AUh3sJyl8pXplymQYhhPEqP5NQoo0OTZKKg=/alt-php/7/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 500 - Internal Server Error

• Checking the configured repositories with the command yum repolist enabled shows the same error on the repository with the name imunify360.

Cause

Authorization on the Imunify360 repositories with the currently stored credentials failed.

Resolution