To disable Amazon S3 certificate revocation verification, create the following registry value on the configured Amazon S3 gateway server and the Veeam Backup Server:
Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication
Value Name: S3TLSRevocationCheck
Value Type: DWORD (32-Bit) Value
Value Data: 0
0 - Disable Revocation Check
1 - Enable Revocation Check
Note: This workaround is compatible only with Veeam Backup & Replication 10a (10.0.1.4854) or newer.