# connectivity

Resolve Ansible unreachable host failures — diagnose SSH connectivity, key auth, Python interpreter, and timeout issues.

Resolve Envoy's 'upstream connect error or disconnect/reset before headers' error caused by service mesh misconfiguration, timeout issues, or unreachable backends.

Diagnose and fix Jenkins agents that go offline mid-build — resolve network timeouts, JVM heap issues, and SSH connection drops.

Diagnose and fix SSH connection refused errors after a Linux server reboot, covering sshd service, firewall rules, port configuration, and host key issues.