Patent ID: 8224942
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A computer-implemented method comprising: instructing clients to request to establish a Hypertext Transfer Protocol (HTTP) connection with an alternate host after failing to establish an HTTP connection with a primary host; identifying a number of Domain Name System (DNS) requests for translating a domain name associated with the alternate host into a network address that one or more DNS servers have received; determining, when the number of DNS requests for translating the domain name associated with the alternate host into the network address exceeds a threshold value, that one or more of the clients may be unable to establish an HTTP connection with the primary host, wherein the threshold value is based at least in part on a median value of the number of DNS requests over a period of time; and generating an alarm when determining, from the number of DNS requests for translating the domain name associated with the alternate host into the network address, that one or more of the client devices may be unable to establish an HTTP connection with the primary host.