PostgreSQLERROR 08001

PostgreSQL: Could Not Connect to Server

PostgreSQL 08001 is raised by the client library when the TCP connection to the PostgreSQL server cannot be established. The server may be down, the port blocked, or the host name incorrect.

Example Query

-- psql -h db.example.com -p 5432 -U app mydb
-- Connection refused or timed out

Common Causes

  1. 1PostgreSQL server is not running or is starting up
  2. 2Firewall blocking port 5432
  3. 3Wrong host or port in the connection string

How to Fix It

Check that PostgreSQL is running: sudo systemctl status postgresql. Verify the port is open with telnet db.example.com 5432. Check pg_hba.conf for client authentication rules and postgresql.conf for the listen_addresses setting.

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