KB3215: Error "Failed to establish connection to Amazon S3 ...
https://www.veeam.com/kb321530.06.2020 · If the Veeam backup server or dedicated gateway server does not have access to the Internet, or the access was restricted intentionally.The following workaround can be used to disable Revocation Check. To disable Amazon S3 certificate revocation verification, create the following registry value on the configured Amazon S3 gateway server and the Veeam Backup …