When using Yarra for clinical workflow monitoring, PHI will be (securely) transmitted to the Logsever. We want to ensure that under no circumstances data can leak out of the hospital network due to a misconfiguration of the service. Therefore, the Yarra RDS client checks on the local DNS server if the MR scanners host and LogServer host are known, and if they are in the same domain. Only if both is true, the data is transmitted. It is possible to disable this mechanism in the source code of the client. We are not providing binaries with disabled DNS check, so you would have to compile the client yourself. However, it's better to configure DNS entries for your scanners.