How to fix Invalid authorization specification in PostgreSQL

What this error means

The "Invalid authorization specification" error indicates that the PostgreSQL server rejected your connection attempt due to authorization failures. This is classified as error code 28000 under "Class 28 - Invalid Authorization Specification" and means the server cannot verify that you have permission to access the requested database. The error typically stems from three sources: mismatched credentials (username/password), missing or incorrect entries in the pg_hba.conf authentication configuration file, or insufficient role permissions in the database. Unlike connection failures that occur before reaching the server, this error indicates the server was contacted but denied access based on its authorization rules.

Typical symptoms

• Connection attempts fail with "FATAL: invalid authorization specification" message
• Applications cannot authenticate to the PostgreSQL database
• Ident authentication failed errors appear, especially when connecting to the postgres user
• Connection string or credentials work on some hosts but not others
• Role exists but cannot log in to the database

Common causes

1. pg_hba.conf file has no entry matching your host, user, and database combination
2. Incorrect username or password provided in connection string
3. Authentication method in pg_hba.conf mismatches what your client is attempting (e.g., expecting password auth but config requires ident)
4. Database role exists but does not have login permission enabled
5. Operating system user does not match expected PostgreSQL role name when using ident authentication
6. Kerberos or ident authentication configured but credentials/systems not properly set up

How to fix "Invalid authorization specification"

# Test connection with explicit credentials
psql -h localhost -U your_username -d your_database -W

# Find pg_hba.conf (typically in the PostgreSQL data directory)
sudo find / -name "pg_hba.conf" 2>/dev/null

# Or ask PostgreSQL directly
sudo -u postgres psql -c "SHOW hba_file;"

# Example pg_hba.conf entry for local socket connections
local   all             all                                     trust

# Example for TCP connections from localhost
host    all             all             127.0.0.1/32            md5
host    all             all             ::1/128                 md5

# Example for TCP from specific IP
host    your_db         your_user       192.168.1.100/32        md5

<type>  <database>  <user>  <address>  <auth-method>

# Using psql as superuser
sudo -u postgres psql -c "SELECT pg_reload_conf();" 

# Or send HUP signal to PostgreSQL process
sudo systemctl reload postgresql
# or
sudo kill -HUP $(pgrep -f "postgres.*master")

sudo systemctl restart postgresql

-- Connect as superuser and check role attributes
\du your_username

-- Output should show "Attributes" like: |
-- Superuser | Create role | Create DB | ...

ALTER ROLE your_username WITH LOGIN;

CREATE ROLE your_username WITH LOGIN PASSWORD 'your_password';

# Using psql
psql -h localhost -U your_username -d your_database -W

# Or using a connection string
psql "postgresql://your_username:your_password@localhost/your_database"

# Check verbose output for debugging
psql -h localhost -U your_username -d your_database -W -v

# View logs (location varies by system)
sudo tail -f /var/log/postgresql/postgresql.log
# or
sudo journalctl -u postgresql -n 50

Advanced notes

Frequently asked questions

What does "Invalid authorization specification" mean?

The "Invalid authorization specification" error indicates that the PostgreSQL server rejected your connection attempt due to authorization failures. This is classified as error code 28000 under "Class 28 - Invalid Authorization Specification" and means the server cannot verify that you have permission to access the requested database. conf authentication configuration file, or insufficient role permissions in the database.

How do I fix "Invalid authorization specification"?

This error (code 28000) occurs when PostgreSQL denies access due to missing or incorrect authentication configuration in pg_hba.conf, invalid credentials, or authorization restrictions. Verify your connection credentials and pg_hba.conf settings to resolve it.

What causes "Invalid authorization specification"?

pg_hba.conf file has no entry matching your host, user, and database combination Incorrect username or password provided in connection string Authentication method in pg_hba.conf mismatches what your client is attempting (e.g., expecting password auth but config requires ident)

Is the "Invalid authorization specification" error serious?

Yes. This is a high-severity error that usually blocks work until it is fixed, but the steps above resolve it.

Related errors

• Invalid binary representation

  How to fix "Invalid binary representation" (22P03) in PostgreSQL

  MEDIUM

• Invalid argument for SQL/JSON datetime function

  How to fix "Invalid argument for SQL/JSON datetime function" in PostgreSQL

  MEDIUM

• Invalid byte sequence for encoding UTF8

  Invalid byte sequence for encoding UTF8 in PostgreSQL

  HIGH

• Internal error

  How to fix "Internal error" in PostgreSQL

  CRITICAL

• Invalid password

  How to fix "Invalid password" in PostgreSQL

  HIGH

• FATAL: no pg_hba.conf entry for host

  How to fix 'FATAL: no pg_hba.conf entry for host' in PostgreSQL

  HIGH

Official resources & further reading

• 📚PostgreSQL Official Documentation
• 📖
  PostgreSQL Official Docs - Authentication Problems(Official Docs)
• 📖
  PostgreSQL Official Docs - Error Codes(Official Docs)
• Metis - PostgreSQL 28000 Error Guide
• Redrock Postgres - Invalid Authorization Specification