A computer implemented method receives a client request message to initiate a network connection. In response to the client request, the method generates a key to represent the client request. The key is generated independent of information provided in the client request message and is generated to correspond to a desired address in a data structure used to track client request message. The method then enters the generated key at the desired address in the data structure and transmits a response message that includes the key back to the client. The network connection between the client and the computer system is established according to the key.