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PostgreSQL Connection Error 08001 Causes

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Main Causes: SQL Error 0 indicates connection attempt failure in PostgreSQL
Incorrect host or IP address in connection string causes failure
Server unreachability from network leads to connection issues
Firewall problems block communication between client and server
Incorrect authentication credentials trigger error
Insufficient user permissions prevent database connection
Database connection limits may cause error
SSL/TLS configuration issues affect connection establishment
Expired or invalid SSL certificates lead to handshake failures
Additional Error Codes: SQL Error 42P01 indicates undefined table references
SQL Error 42703 occurs with undefined column usage
SQL Error 23505 shows unique constraint violations
SQL Error 28000 indicates authentication problems
SQL Error 08006 indicates database connection failures