PostgreSQL Technical Guide

How to Resolve PostgreSQL Password Authentication Failed Error?

PostgreSQL connection issues are divided into service and port access, pg_hba.conf rule matching, and role/password verification. Connection refused, no pg_hba.conf entry, and password authentication failed show different layers.

pg_hba.confPassword FailedSCRAMPort 5432listen_addresses

Review Error Messages Get Technical Support

database.log

FATAL: password authentication failed for user "uygulama"
FATAL: no pg_hba.conf entry for host "10.0.0.5", user "uygulama", database "app", no encryption

01Save the error message verbatim

02Separate service, port and disk state

03Verify authorization and application config

04Implement backup and controlled change

Technical description

PostgreSQL Authentication What does it mean?

The first distinction is whether the problem originates from the application connection information, the database service, the network layer, or the data file. Instead of the general message in the browser, the engine's own error log should be taken as basis.

cPanel and Plesk make management easier, but service, port, user, role and data integrity checks must be verified with the database engine's native tools.

In authority issues, the principle of least authority should be preserved; In case of service and recovery problems, a physical or logical backup should be prepared before touching the data files.

Enlarging a setting or relaxing the security may provide temporary relief. The permanent solution is to apply the smallest change by measuring at which layer the error starts.

Do not add the 0.0.0.0/0 trust rule.

Log messages

Error codes, their meanings and first safe operation

8 registration

01kritik

password authentication failed for user

Meaning: Password verification failed.

Possible cause: Incorrect password, passwordless role or SCRAM incompatibility.

02kritik

no pg_hba.conf entry for host

Meaning: No suitable HBA rule exists.

Possible cause: CIDR, database, user, or SSL type incorrect.

03kritik

connection refused on port 5432

Meaning: TCP connection is unable to reach PostgreSQL.

Possible cause: Service, listen_addresses or firewall.

04warning

role does not exist

Meaning: Cluster’da rol yok.

Possible cause: Incorrect server/port or role not created.

05warning

role is not permitted to log in

Meaning: Rolde LOGIN yok.

Possible cause: A Group Role Is Being Used.

06warning

database does not exist

Meaning: Hedef database yok.

Possible cause: Connection string is incorrect

07bilgi

Peer authentication failed

Meaning: OS user name does not match the role.

Possible cause: Peer rule and sudo user are different.

08bilgi

no encryption

Meaning: The client is not using SSL.

Possible cause: Only the hostssl rule exists.

No records matching this expression were found.

Copiable controls

SSH, SQL and service diagnostic commands

Service and port

systemctl status postgresql --no-pager
ss -lntp | grep 5432

Displays service and listening status.

Active config paths

sudo -u postgres psql -Atc "SHOW config_file; SHOW hba_file; SHOW data_directory;"

Displays real config files.

Listening settings

sudo -u postgres psql -c "SHOW listen_addresses; SHOW port; SHOW ssl;"

Displays network and SSL settings.

Role control

sudo -u postgres psql -c "\du+"

Lists role features.

HBA verification.

sudo -u postgres psql -c "SELECT line_number,type,database,user_name,address,auth_method,error FROM pg_hba_file_rules ORDER BY line_number;"

Shows the rules and parse errors.

Client test

psql "host=127.0.0.1 port=5432 dbname=app user=app sslmode=prefer"

Tests the connection with open parameters.

By hosting environment

cPanel, Plesk and panelless server controls

cPanel / WHM

Examine the PostgreSQL error with cPanel services, users, and resource layers.

Compare the panel service status with the engine's own error log within the same time interval.
Account users, database mapping, and resource limits must be verified.
Prepare a backup and a rollback before making changes outside the panel.

Plesk Obsidian

Use Database Servers, subscription users, and repair tools for PostgreSQL with controlled access.

Tools & Settings > Database Servers section, verify the correct instance.
Check subscription users and remote access rules with minimum scope.
Apply repair commands first with monitoring and latest backup.

Panel-less Server

Diagnose PostgreSQL service, port, log, and native client tools directly.

Determine the correct service and instance.
Match the error time with application and engine logs.
Keep config or data file changes small and reversible

Absolutely don't

Do not add the 0.0.0.0/0 trust rule.
Do not confuse the PostgreSQL role password with the OS password.
Do not expose to the internet by opening listen_addresses=* and setting firewall limits.
Do not leave the password in the connection URL open.

Post-solution verification

No parse error in pg_hba_file_rules.
The application is connecting correctly with the right host, port, db, and sslmode.
Role has only the required permissions.
5432 is only accessible from required networks.

Internal SEO content set

Manufacturer documentation

PostgreSQL pg_hba.conf PostgreSQL Authentication Problems PostgreSQL Password Authentication

Frequently asked questions

PostgreSQL Authentication questions about

What is the first check for a PostgreSQL Authentication error?

Full error message and timestamp is recorded; then service, port, disk and application config is separated.

Is a service restart from the panel sufficient?

May run temporarily but the root cause must be verified with the engine's error log, native client, and source metrics.

Should the remote database port be open to everyone?

No. It should only be used for required special networks, VPNs, or specific source IP addresses; firewall and engine access rules should be used.

Is it correct to give full access to the database user?

Applications should only access the database, schema, and operations required with the least privilege principle.

Should the error be backed up before it is resolved?

Even in cases of permission and config issues, a current backup is recommended; corruption, service failure to start, or file intervention is mandatory.

Can I run the commands directly in production?

First, the motor, version, file path, and permissions must be verified; data-changing commands should be applied in the test or backup environment.

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No. Technical quality, real user benefit, internal linking, site authority, speed, and Search Console data collectively produce a result.

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