What is
PostgresDB 08006: Connection failure
?
- Check the PostgreSQL service status:
- On Unix/Linux:
sudo service postgresql statusorsystemctl status postgresql - On Windows, open Services from the Control Panel and look for PostgreSQL service.
- On Unix/Linux:
- Review PostgreSQL Server Logs:
- Default location varies, but check
/var/log/postgresql/on Linux or the data directory on Windows. - Look for entries around the time the error occurred to find specific reasons for failure.
- Default location varies, but check
- Verify Network Connectivity:
- Ping the database server from the client machine:
ping <database_server_ip> - If the database is on a remote server, use
telnet <database_server_ip> 5432to check if the PostgreSQL port is reachable.
- Ping the database server from the client machine:
- Check Database Connection Configuration:
- Verify the connection details in your application configuration file or command line, including host, port, user, and password.
- For a command line test:
psql -h <host> -p <port> -U <user> -d <database_name>
- Ensure PostgreSQL is Listening on the Correct Port and Interfaces:
- On the database server, check
postgresql.confforlisten_addressesandportsettings. - You can find
postgresql.conftypically in the data directory/var/lib/postgresql/<version>/data/on Linux.
- On the database server, check
- Review pg_hba.conf File:
- Ensure your client’s IP address or subnet is allowed to connect to the database in the
pg_hba.conffile, located in the same directory aspostgresql.conf. - Changes to
pg_hba.confrequire reloading PostgreSQL:SELECT pg_reload_conf();orsystemctl reload postgresqlon the server.
- Ensure your client’s IP address or subnet is allowed to connect to the database in the
- Check for Active Connections and Locks:
- If you can connect through another session or tool, check for excessive connections or locks that might prevent new connections:
- For active connections:
SELECT * FROM pg_stat_activity; - For locks:
SELECT * FROM pg_locks JOIN pg_class ON pg_locks.relation = pg_class.oid;
- For active connections:
- If you can connect through another session or tool, check for excessive connections or locks that might prevent new connections:
- Restart PostgreSQL Service:
- If it's safe to do so, try restarting the PostgreSQL service:
- On Unix/Linux:
sudo service postgresql restartorsystemctl restart postgresql - On Windows, use the Services panel to restart the PostgreSQL service.
- On Unix/Linux:
- If it's safe to do so, try restarting the PostgreSQL service:
- Check System Resources:
- Ensure the server has sufficient CPU, memory, and disk space:
- On Unix/Linux, use commands like
top,free -m, anddf -h. - On Windows, use Task Manager or Resource Monitor.
- On Unix/Linux, use commands like
- Ensure the server has sufficient CPU, memory, and disk space:
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