Verified diagnostic signature
MySQL accepted transport but rejected the account, database, host, or authentication method.
Match output from mysql, 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
Unknown databaseOneLiners matches this pattern in your browser. Your pasted output is not stored or indexed.
Likely causes
What usually produces this signal
- Wrong account or database
- Host grant mismatch
- Client/server authentication mismatch
- TLS or key retrieval policy
Safe next checks
Collect evidence before changing the system
Check whether a TCP port accepts connections
nc -vz <host> <port>The output matches the expected target and exits without an error.
Inspect a remote TLS certificate
openssl s_client -connect <host>:<port> -servername <host> </dev/null 2>/dev/null | openssl x509 -noout -subject -issuer -datesThe output matches the expected target and exits without an error.