A method of establishing a secure communication link comprises: (a) receiving a request that (i) includes an identifier of a client and (ii) was sent in response to a determination that a DNS request from the client corresponds to a first computer configured to communicate securely; (b) comparing the received client identifier to at least one stored client identifier; (c) determining, based on the comparison, whether the client is authorized to communicate with the first computer; (d) generating a resource used to establish the secure communication link between the client and the first computer; (e) generating a message in response to determining that the client is not authorized to communicate with the first computer; and (f) in response to determining that the client is authorized to communicate with the first computer, making the resource available to the client to automatically establish the secure communication link.