Technology for providing communication connectivity between network entities located in different isolated communication networks through a centralized cloud service. A cloud service connector in a source communication network receives an initial connection request from a source end point device in the source communication network, and determines a customer name and requested service associated with the port number indicated in the request. Mappings are established between the source end point device and a destination end point device that provides the requested service from within a destination communication network that is associated with the customer name. Network traffic is conveyed between the source end point device and the destination end point device through the cloud service by tunneling packets over connections between the cloud service connector in the source communication network and the cloud service and between a cloud service connector in the destination communication network and the cloud service.