How to Resolve PgAdmin4 'Connection Timeout Expired' Error When Connecting to PostgreSQL Server?

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Summary: Learn how to fix the 'Connection Timeout Expired' error in PgAdmin4 when connecting to a PostgreSQL server. Troubleshooting steps included for quick resolution.
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How to Resolve PgAdmin4 Connection Timeout Expired Error When Connecting to PostgreSQL Server?

If you're using PgAdmin4 to manage your PostgreSQL server, encountering a "Connection Timeout Expired" error can be frustrating. This error typically indicates that PgAdmin4 is unable to establish a connection with the PostgreSQL server within the allotted time.

This guide will walk you through some common causes and solutions to resolve this issue.

Common Causes

Network Issues: The most common cause of a connection timeout is network connectivity problems. Ensure your device can communicate with the server.

Firewall Settings: Firewalls can sometimes block connections to the PostgreSQL server.

Server Configuration: The server itself might not be configured to accept incoming connections from PgAdmin4.

Incorrect Server Details: Any error in the server's IP address, port, username, or password configuration can lead to a timeout.

Database Server Not Running: Ensure the PostgreSQL service is running.

Troubleshooting Steps

Verify Network Connectivity

Ping the Server: From your terminal or command prompt, try pinging the PostgreSQL server's IP address to check if it is reachable.

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Check Routes: Ensure that the network routes between your client and the server are properly configured and not blocked.

Firewall Settings

Local Firewall: Disable your local firewall temporarily to see if it is causing the problem.

On Windows, use the Windows Firewall settings.

On macOS, navigate to Security & Privacy > Firewall.

Server Firewall: If the server itself has a firewall (such as UFW on Ubuntu), ensure that it allows connections on the PostgreSQL port (default 5432).

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Server Configuration

PostgreSQL Configuration Files:

pg_hba.conf: Ensure this file is configured to allow connections from your client IP address.

postgresql.conf: Check if the listen_addresses setting includes the server's IP address or is set to '*' to accept connections from any IP.

Restart PostgreSQL Service:

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Verify Connection Details

IP Address and Port: Double-check the PostgreSQL server's IP address and port number in PgAdmin4.

Credentials: Make sure the username and password used for the connection are correct.

Ensure PostgreSQL is Running

Use the following command on your PostgreSQL server to check if the database server is running:

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If it's not running, start the service:

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Conclusion

Resolving the "Connection Timeout Expired" error in PgAdmin4 when connecting to a PostgreSQL server typically involves ensuring network connectivity, proper firewall settings, correct server configuration, and verifying that the server is running. By methodically checking each of these areas, you should be able to pinpoint and resolve the issue quickly.

Remember, understanding the root cause of such errors will help you prevent them in the future and improve your overall database management experience.