By default, RayVentory Scan Engine uses TLS 1.0 to upload and receive files over HTTPS. This can lead to problems if the server / client RayVentory Scan Engine is communicating with only has TLS 1.2 enabled for security reasons.
The following registry values will force .NET and therefore also RayVentory Scan Engine to use TLS 1.2:
Name: SystemDefaultTlsVersions Type: DWORD Data: 1
Name: SchUseStrongCrypto Type: DWORD Data: 1
For the changes to take effect, the machine needs to be rebooted.