Whitelisted IP addresses lost for Tier 1 and Tier 2+ Microsoft Dynamics 365 for Finance and Operations, Enterprise edition environments
The most recent maintenance operation (November 7, 2017) included cleanup activities that may have unintentionally removed your whitelisted IP addresses configured to access the remote desktop (RDP) port for all Microsoft managed non-production Sandbox (Tier 1 & Tier 2+) environments.