OneLinersCommand workbench
Verified diagnostic signature

OpenVPN failed authentication, TLS verification, liveness, or endpoint resolution.

Match output from openvpn, understand the likely cause, then continue with sourced, read-only checks.

Confidence
high
Platforms
linux · macos · windows
Verified
2026-07-24
Recognized output

Signature matched locally

Inactivity timeout

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Likely causes

What usually produces this signal

  1. Credential rejection
  2. Certificate or clock issue
  3. Blocked UDP/TCP path
  4. DNS failure
Safe next checks

Collect evidence before changing the system

01

Show recent OpenVPN service logs

journalctl -u openvpn --since <since> --no-pager

The output matches the expected target and exits without an error.

02

Resolve a hostname to its IP address

dig +short <domain>

The output matches the expected target and exits without an error.

03

Check whether a TCP port accepts connections

nc -vz <host> <port>

The output matches the expected target and exits without an error.

04

Inspect a remote TLS certificate

openssl s_client -connect <host>:<port> -servername <host> </dev/null 2>/dev/null | openssl x509 -noout -subject -issuer -dates

The output matches the expected target and exits without an error.