Ping Works but the App Doesn’t Fix It with TCP Handshake Palo Alto + Cisco

Ping works, but the website or app does not open? Ping only proves ICMP. Your app uses TCP on a specific port. In this video you learn to read the TCP three-way handshake and find the problem from 4 fingerprints, with real packet captures, Palo Alto and Cisco. Chapters: 0:00 Ping works, app doesn't 0:35 The three-way handshake 1:20 Fingerprint 1: SYN, silence 1:49 Fingerprint 2: SYN, instant RST 2:15 Fingerprint 3: SYN-ACK, no ACK 2:46 Fingerprint 4: handshake works, then RST 3:17 Prove it: Test-NetConnection, nc, curl 3:39 Wireshark filter 4:08 MTU / MSS trap 4:30 Palo Alto: traffic log, counters, packet capture 5:14 Cisco: ACL, established, route, EPC, MTU 6:32 The method 6:54 Summary Packets in the video are real lab captures. Cisco and PAN-OS command outputs are labeled examples; verify on your own devices. #PaloAlto #Cisco #TCP #NetworkTroubleshooting #Wireshark