Networking posts

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All posts in the Networking category.

category Networking

LatestNetworkingSSH KEX Hang: A VPN Tunnel at MTU 1500 is not a TunnelSSH connects, then dies mid-handshake. A local port-forward to a remote database cluster through a bastion stopped working, hanging on the first large packet of the SSH session. How an oversized MTU on a VPN interface created a silent black hole.September 15, 202612 min readRead →

September 2026

07MonNetworking13 min readAWS IAM Identity Center Sign-In Failure Caused by an MTU Black HoleWhen the AWS access portal loads but authentication hangs indefinitely, the fault may lie below the application layer. How a 1478-byte path MTU and dropped ICMP messages created a silent TLS handshake black hole.