Resolve "no pg_hba.conf entry for host on PostgreSQL

The “pg_hba.conf” entry for a host on a Windows system. The “pg_hba.conf” file in PostgreSQL is crucial for managing client authentication. Specifying which hosts are allowed to connect to the database server. In this article, we shall discuss how to Resolve “no pg_hba.conf entry for host on PostgreSQL. Please see How to install PostgreSQL on Ubuntu, Remove saved RDP connections in Windows, and how to Install PostgreSQL on Windows server as Veeam Database Engine.

The pg_hba.conf file (Host-Based Authentication Configuration) is a PostgreSQL configuration file that controls client authentication. It specifies which hosts are allowed to connect to the PostgreSQL server. Which databases users are allowed to access, and with what authentication method.

Note: By default only Localhost can connect. Remember to exercise caution when modifying configuration files, and always back up files before making changes to ensure you can revert to a working state if needed.

The problem is the default configuration in the file below”. This file pg_hba.conf defines which client and how this client can connect to the PostgreSQL server as discussed above. Please learn more about this file.

C:\Programfiles\PostgreSQL\15\data\pg_hba.conf"

Why was this error “no pg_hba.conf entry for host” pompted?

This issue occurs when a client attempts to connect to the PostgreSQL database. But there is no corresponding entry in the pg_hba.conf file that allows the connection from the specified host due to the default rule. Below are some possible reasons:

“no pg_hba.conf entry”: This means that the PostgreSQL server could not find an entry in the pg_hba.conf file.
“for host”: Specifies that the issue is related to the host from which the connection is attempted.

Fix no pg_hba.conf entry for host

To resolve this issue, follow these steps. Edit the file access policy configuration file. To locate pg_hba.conf by navigating to the PostgreSQL installation directory on your Windows system.

pg_hba.conf

Edit pg_hba.conf by opening the “pg_hba.conf” using a text editor of your choice. Here I am using Notepad++.

Below are the default rules

Add an entry specifying the host, database, user, authentication method, and any other necessary parameters.

Please see the task the issue emanated from “Migrate Veeam Configuration Database to PostgreSQL Server“. It was enough for me to specify the allow “all” in this file as shown below.

This entry allows connections from hosts. You could also try this # TYPE DATABASE USER CIDR-ADDRESS METHOD.

host  all  all 0.0.0.0/0 scram-sha-256

Restart the postgresql service.

When this is done, PostgreSQL database should allow connections from the host or all hosts.

Make sure to adjust the parameters in the “pg_hba.conf” entry according to your specific setup, including the host’s IP address, authentication method, and any other relevant details.

Pg_hba file could not be loaded

If you run into the error below, know there is a a syntax error with the pg_hba.config file

FAQs on pg_hba.conf

How can I grant specific database access to a user using pg_hba.conf?

To grant specific database access to a user, modify the pg_hba.conf file by adding an entry that specifies the user, database, authentication method, and access permissions

What steps should I take if I want to restrict access to PostgreSQL from certain IP addresses using pg_hba.conf?

To restrict access from specific IP addresses, edit the pg_hba.conf file to include rules that define the allowed or denied connections based on the IP address ranges, ensuring the desired level of security.

Is it possible to reload pg_hba.conf without restarting the PostgreSQL server?

Yes, you can reload the pg_hba.conf file without restarting the PostgreSQL server by using the pg_ctl reload command or sending a SIGHUP signal to the server process. This allows you to apply changes to the authentication configuration without interrupting active database connections.

I hope you found this article useful on how to Resolve “no pg_hba.conf entry for host on PostgreSQL. Please feel free to leave a comment below.