Verified diagnostic signature
PostgreSQL is unreachable or cannot accept another client under the current policy or capacity.
Match output from postgresql, 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
connection to server .* failed: timeout expiredOneLiners matches this pattern in your browser. Your pasted output is not stored or indexed.
Likely causes
What usually produces this signal
- Listener unavailable
- Network timeout
- pg_hba policy
- Connection exhaustion
Safe next checks
Collect evidence before changing the system
Resolve a hostname to its IP address
dig +short <domain>The output matches the expected target and exits without an error.
Check whether a TCP port accepts connections
nc -vz <host> <port>The output matches the expected target and exits without an error.
List listening TCP ports and their processes
lsof -iTCP -sTCP:LISTEN -n -PThe output matches the expected target and exits without an error.
Show Linux memory and swap usage
free -hThe output matches the expected target and exits without an error.