5/25/2023 0 Comments Wireshark retransmission![]() Previously in the packet trace I can see that the TCP 3-way handshake succeeded (and succeeds EVERY time a connection attempt was made). The above traffic is filtered to a window that shows the error state. Appliances that lack a native ability to capture traffic / PCAP files contributes to less direct troubleshooting paths.įor reference, here is an image that shows the type of traffic I was seeing on a system attempting to initiate a secure session: This issue took longer to troubleshoot than I would have liked due to the specialized nature of endpoints involved. The core problem was an MTU mis-match between our gigabit network and our 100-megabit VPN tunnel. I performed a comprehensive analysis of our networking infrastructure and router configurations and captured PCAP files to gather enough data to root cause the problem. ![]() ![]() Some machines were unable to communicate at all while other machines could occasionally and sporadically establish a connection that would fail at inopportune times. ![]() We had a mysterious issue in our network that caused certain SSH sessions and HTTPS/TLS sessions to fail intermittently. ![]()
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