Patent ID: 9661083
Date: 2017-05-23
CPC Classifications: H04L

Claim:
1. A method comprising: sending, by a first computing device that is behind a firewall, a first request message to a first port of a second computing device that is outside the firewall, wherein the first port is associated with a first flow of a plurality of concurrent flows between the first computing device and the second computing device, and wherein the first request message comprises a request for the second computing device to send a first response message to the first computing device after a specified first time period; sending, by the first computing device, a second request message to a second port of the second computing device that is associated with a second flow of the plurality of concurrent flows, the second request message comprising a request for the second computing device to send a second response message to the first computing device after a specified second time period that is greater than the specified first time period; and responsive to receiving the first response message and failing to receive the second response message, performing the following comprising: