View the manual. You can view the manual for an older version or download a PDF of a manual from the below table. In my case, when I was installing postgresql-11.0-1-windows-x64.exe on Windows 10, I had faced the same problem. I just uninstalled the Microsoft Visual C Redistributable (the latest one for both 32 and 64 bit) and then tried to install postgresql-11.0-1-windows-x64.exe again, and it worked for me. If postgresql was already running before please try this: Solutions: 1. Reboot your computer 2. If that doesn't help look for the hidden system file postmaster.pid in the postgresql data folder, delete it and reboot your computer again. Check the postgresql service in the windows services (control panel-administration).

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• Watch this video for step by step instructions. Before trying any steps make sure that Windows is fully fixed and updated. If HM2 won't connect to PostgreSQL after a recent Windows update please try these steps first.

Firstly, it is important to understand that for most Unix distributions, the default Postgres user neither requires nor uses a password for authentication. Instead, depending how Postgres was originally installed and what version you are using, the default authentication method will either be ident or peer.

ident authentication uses the operating system’s identification server running at TCP port 113 to verify the user’s credentials.

peer authentication on the other hand, is used for local connections and verifies that the logged in username of the operating system matches the username for the Postgres database.

Login and Connect as Default User

For most systems, the default Postgres user is postgres and a password is not required for authentication. Thus, to add a password, we must first login and connect as the postgres user.

If you successfully connected and are viewing the psql prompt, jump down to the Changing the Password section.

If you received an error stating that the database “postgres” doesn’t exist, try connecting to the template1 database instead and if successful, continue to Changing the Password.

Authentication Error

If you receive an authentication error when attempting to connect to the psql client, you may need to alter the Postgres authentication config file (pg_hfa.conf).

Open the config file, typically located at /etc/postgresql/#.#/main/pg_hba.conf, where #.# is the Postgres version you are using:

The auth config file is a list of authentication rules. Scroll down the file until you locate the first line displaying the postgres user in the third column (if such a line exists). Uncomment the line if necessary (remove the semicolon), or otherwise if the line is missing entirely, add the following line to the top of the file and save your changes:

This authentication rule simply tells Postgres that for local connections established to all databases for the user postgres, authenticate using the peer protocol.

Note: Some older versions of Postgres prefer the default authentication method of ident, but most modern installations will utilize peer as specified above instead. You may need to test both if your results differ.

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Now with your configuration file updated, repeat the steps in the Login and Connect as Default User section to try to connect to as the default postgres user. Once successful, proceed with changing the password.

Changing the Password

Postgresql

With a connection now established to Postgres at the psql prompt, issue the ALTER USER command to change the password for the postgres user:

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If successful, Postgres will output a confirmation of ALTER ROLE as seen above.

Finally, exit the psql client by using the q command.

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You’re all done. The default postgres user now has a password associated with the account for use in your other applications.