PostgresDB 08006: Connection failure

Happens when the connection to the database fails.
  1. Check the PostgreSQL service status:
    • On Unix/Linux: sudo service postgresql status or systemctl status postgresql
    • On Windows, open Services from the Control Panel and look for PostgreSQL service.
  2. Review PostgreSQL Server Logs:
    • Default location varies, but check /var/log/postgresql/ on Linux or the data directory on Windows.
    • Look for entries around the time the error occurred to find specific reasons for failure.
  3. Verify Network Connectivity:
    • Ping the database server from the client machine: ping <database_server_ip>
    • If the database is on a remote server, use telnet <database_server_ip> 5432 to check if the PostgreSQL port is reachable.
  4. Check Database Connection Configuration:
    • Verify the connection details in your application configuration file or command line, including host, port, user, and password.
    • For a command line test: psql -h <host> -p <port> -U <user> -d <database_name>
  5. Ensure PostgreSQL is Listening on the Correct Port and Interfaces:
    • On the database server, check postgresql.conf for listen_addresses and port settings.
    • You can find postgresql.conf typically in the data directory /var/lib/postgresql/<version>/data/ on Linux.
  6. Review pg_hba.conf File:
    • Ensure your client’s IP address or subnet is allowed to connect to the database in the pg_hba.conf file, located in the same directory as postgresql.conf.
    • Changes to pg_hba.conf require reloading PostgreSQL: SELECT pg_reload_conf(); or systemctl reload postgresql on the server.
  7. Check for Active Connections and Locks:
    • If you can connect through another session or tool, check for excessive connections or locks that might prevent new connections:
      • For active connections: SELECT * FROM pg_stat_activity;
      • For locks: SELECT * FROM pg_locks JOIN pg_class ON pg_locks.relation = pg_class.oid;
  8. Restart PostgreSQL Service:
    • If it's safe to do so, try restarting the PostgreSQL service:
      • On Unix/Linux: sudo service postgresql restart or systemctl restart postgresql
      • On Windows, use the Services panel to restart the PostgreSQL service.
  9. Check System Resources:
    • Ensure the server has sufficient CPU, memory, and disk space:
      • On Unix/Linux, use commands like top, free -m, and df -h.
      • On Windows, use Task Manager or Resource Monitor.

Never debug

PostgresDB

manually again

Let Dr. Droid create custom investigation plans for your infrastructure.

Book Demo
Automate Debugging for
PostgresDB
See how Dr. Droid creates investigation plans for your infrastructure.
Book Demo

MORE ISSUES

PostgresDB 53100: Disk full
When the disk storage is full and cannot accommodate more data.
PostgresDB XX001: Data corrupted
Raised when data corruption is detected within the database.
PostgresDB XX000: Internal error
Represents an internal error that should not normally occur
PostgresDB 0A000: Feature not supported
Occurs when attempting to use a feature that is not supported by PostgreSQL.
PostgresDB 57P01: Admin shutdown
Thrown when the database is shut down administratively
PostgresDB 58000: System error
Represents a general system error
PostgresDB 53200: Out of memory
When the database server runs out of memory during an operation.
PostgresDB 22001: String data right truncation
Happens when the data is too large for the target column.
PostgresDB 08003: Connection does not exist
When an operation is attempted on a non-existent connection.
PostgresDB 22007: Invalid datetime format
When the provided date or time format is invalid.
PostgresDB 22012: Division by zero
Occurs when there's an attempt to divide a number by zero.
PostgresDB 22003: Numeric value out of range
Thrown when a numeric value exceeds the range of the target column.
PostgresDB 08001: SQL client unable to establish SQL connection
Occurs when the client is unable to connect to the database server.
PostgresDB 40001: Transaction rollback
Indicates that the transaction was rolled back
PostgresDB 40P01: Deadlock detected
Raised when a deadlock situation is detected within a transaction.
PostgresDB 08006: Connection failure
Happens when the connection to the database fails.
PostgresDB 40001: Serialization failure
Thrown during a transaction if a serialization issue occurs.
PostgresDB 42P18: Indeterminate Datatype
The data type could not be determined.
PostgresDB 23514: Check violation
Happens when a CHECK constraint is not satisfied.
PostgresDB 23503: Foreign key violation
When a foreign key constraint is violated.
PostgresDB 23502: Not null violation
Occurs when a null value is inserted into a column with a NOT NULL constraint.
PostgresDB 23505: Unique violation
Thrown when a duplicate value violates a unique constraint.
PostgresDB 40002: Transaction Integrity Constraint Violation
The transaction violated an integrity constraint.
PostgresDB 42602: Invalid name
Happens when an identifier is invalid.
PostgresDB 42501: Insufficient privilege
When a user lacks the necessary permissions to perform an action.
PostgresDB 42601: Syntax error
Occurs when there's a mistake in the SQL syntax.
PostgresDB 42P21: Collation Mismatch
Mismatch in collation settings.
PostgresDB 42622: Name Too Long
The provided name exceeds the maximum allowed length.
PostgresDB 42804: Datatype Mismatch
Data type mismatch in the SQL statement.
PostgresDB 42939: Reserved Name
Attempted to use a reserved name.
PostgresDB 42602: Invalid Name
The specified name is invalid.
PostgresDB 42830: Invalid Foreign Key
Foreign key constraint is invalid.
PostgresDB 42P19: Invalid Recursion
Invalid use of recursion in a query.
PostgresDB 42846: Cannot Coerce
Unable to coerce a value to the required type.
PostgresDB 42P20: Windowing Error
Error in the window function.
PostgresDB 42803: Grouping Error
Error in the GROUP BY clause.
PostgresDB 42601: Syntax Error
Invalid syntax in the SQL statement.
PostgresDB 42501: Insufficient Privilege
Lacking sufficient privileges to perform the operation.
PostgresDB 42000: Syntax Error or Access Rule Violation
General syntax error or access rule violation.
PostgresDB 40P01: Deadlock Detected
Deadlock detected among transactions.
PostgresDB 40000: Transaction Rollback
General transaction rollback occurred.
PostgresDB 3F000: Invalid Schema Name
The specified schema name is invalid.
PostgresDB 40003: Statement Completion Unknown
The result of the SQL statement is unknown.
PostgresDB 3D000: Invalid Catalog Name
The specified catalog name is invalid.
PostgresDB 40001: Serialization Failure
Transaction could not be serialized due to a conflict.
PostgresDB 3B001: Invalid Savepoint Specification
The savepoint specification is invalid.
PostgresDB 38002: Modifying SQL Data Not Permitted
Modifying SQL data is not allowed in the external routine.
PostgresDB 3B000: Savepoint Exception
General savepoint exception occurred.
PostgresDB 39004: Null Value Not Allowed
Null value was not allowed in the external routine.
PostgresDB 39001: Invalid SQLSTATE Returned
An invalid SQLSTATE was returned by the external routine.
PostgresDB 39000: External Routine Invocation Exception
General external routine invocation exception.
PostgresDB 38004: Reading SQL Data Not Permitted
Reading SQL data is not allowed in the external routine.
PostgresDB 38003: Prohibited SQL Statement Attempted
Prohibited SQL statement was attempted in the external routine.
PostgresDB 38001: Containing SQL Not Permitted
SQL is not allowed in the external routine.
PostgresDB 34000: Invalid Cursor Name
The specified cursor name is invalid.
PostgresDB 38000: External Routine Exception
General external routine exception occurred.
PostgresDB 2F004: Reading SQL Data Not Permitted
Reading SQL data is not allowed in the current context.
PostgresDB 2F003: Prohibited SQL Statement Attempted
Prohibited SQL statement was attempted.
PostgresDB 2F002: Modifying SQL Data Not Permitted
Modifying SQL data is not allowed in the current context.
PostgresDB 2F005: Function Executed No Return Statement
Function executed without returning a value.
PostgresDB 25P02: In Failed SQL Transaction
SQL transaction is in a failed state.
PostgresDB 2F000: SQL Routine Exception
General SQL routine exception.
PostgresDB 2D000: Invalid Transaction Termination
Transaction termination is invalid.
PostgresDB 2BP01: Dependent Objects Still Exist
Dependent objects still exist in the database.
PostgresDB 28P01: Invalid Password
Provided password is invalid.
PostgresDB 2B000: Dependent Privilege Descriptors Still Exist
Dependent privilege descriptors are still present.
PostgresDB 26000: Invalid SQL Statement Name
The specified SQL statement name is invalid.
PostgresDB 25006: Read Only SQL Transaction
Attempted modification in a read-only transaction.
PostgresDB 27000: Triggered Data Change Violation
Data change violation triggered by the operation.
PostgresDB 28000: Invalid Authorization Specification
Authorization specification is invalid.
PostgresDB 25P03: Idle in Transaction Session Timeout
Transaction session timed out due to idleness.
PostgresDB 25P01: No Active SQL Transaction
No active SQL transaction to execute.
PostgresDB 25007: Schema and Data Statement Mixing Not Supported
Mixing schema and data statements is not supported.
PostgresDB 25005: No Active SQL Transaction for Branch Transaction
No active SQL transaction for a branch transaction.
PostgresDB 25004: Inappropriate Isolation Level for Branch Transaction
Inappropriate isolation level for a branch transaction.
PostgresDB 25008: Held Cursor Requires Same Isolation Level
Held cursor requires the same isolation level.
PostgresDB 25003: Inappropriate Access Mode for Branch Transaction
Inappropriate access mode for a branch transaction.
PostgresDB 25001: Active SQL Transaction
SQL transaction is already active.
PostgresDB 25002: Branch Transaction Already Active
A branch transaction is already active.
PostgresDB 22P04: Bad Copy File Format
Invalid format in a COPY file.
PostgresDB 25000: Invalid Transaction State
Transaction is in an invalid state.
PostgresDB 24000: Invalid Cursor State
Operation attempted on a cursor in an invalid state.
PostgresDB 23505: Unique Violation
Duplicate value violates a unique constraint.
PostgresDB 23001: Restrict Violation
Violation of a RESTRICT constraint.
PostgresDB 23P01: Exclusion Violation
An exclusion constraint was violated.
PostgresDB 23514: Check Violation
A CHECK constraint was violated.
PostgresDB 23503: Foreign Key Violation
A foreign key constraint was violated.
PostgresDB 23502: Not Null Violation
Null value was inserted into a column with a NOT NULL constraint.
PostgresDB 23000: Integrity Constraint Violation
A general integrity constraint violation occurred.
PostgresDB 2200T: Invalid XML Processing Instruction
The XML processing instruction is invalid.
PostgresDB 2200S: Invalid XML Comment
The XML comment is invalid.
PostgresDB 2200N: Invalid XML Content
Content within the XML is invalid.
PostgresDB 2200M: Invalid XML Document
The XML document is invalid.
PostgresDB 2200L: Not an XML Document
The provided data is not a valid XML document.
PostgresDB 22P05: Untranslatable Character
Character could not be translated.
PostgresDB 22P03: Invalid Binary Representation
Binary representation of a value is invalid.
PostgresDB 22P02: Invalid Text Representation
Text representation of a value is invalid.
PostgresDB 22P01: Floating Point Exception
Floating point operation caused an exception.
PostgresDB 2200F: Zero Length Character String
Character string has zero length.
PostgresDB 22024: Unterminated C String
C string was not properly terminated.

Backed by

Platform

AI OpsAlert Grouping & De-DuplicationPlayBooksKubernetes Bot

Resources

DocumentationFun For DevsBlog

Contact

Contact UsAbout UsCareersTerms and ConditionsPrivacy PolicyShipping & and Delivery PolicyCancellation & Refund Policy

Connect

Slack CommunityGithubLinkedInX (Twitter)
Made with ❤️ in Bangalore & San Francisco 🏢

Doctor Droid