(When we are in doubt, can we analyze and locate it from the network communication? The answer is yes, it depends on how to use network analysis software to locate and use communication problems. The analysis process of the system downtime caused by the BUG of the electricity billing system, the visit to the SOHU163 homepage changed to the error analysis report of the homepage on a certain day in 2008, the failure factors of the portal website visit, a case of VOIP communication interference, abnormal interruption of online video, and packet capture A case of verifying the IOSBUG of a power company)