21430: Acronis Cloud Backup: Backup to Acronis Cloud Storage Fails with "The certification server is unavailable"

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The online server is temporarily down. Please reattempt the backup in ten minutes or later

This article applies to:

  • Acronis Backup to Cloud 11.5 (Acronis Backup & Recovery 11.5 Online)
  • Acronis Backup & Recovery 11 Online
  • Acronis Backup & Recovery 10 Online


  1. Using Acronis Backup & Recovery, you attempt to back up to the Acronis Online Storage;
  2. The attempt fails with the following error message:

    The certification server is unavailable


The Acronis Online Storage certification server is temporary unavailable e.g. due to a short-term maintenance.


Please reattempt the backup in ten minutes or later.

Should the error reappear regularly, please check the connection with Acronis Cloud Connection Verification Tool.

More information

Please contact Acronis Customer Central if you need assistance.


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