Fixing connection issues in the PostgreSQL ODBC driver requires a systematic approach that addresses architecture mismatches, network/server configurations, credential errors, or driver-specific bugs. 🛠️ 1. Resolve Bitness Mismatches (32-bit vs. 64-bit)
The most frequent cause of an invisible or failing Data Source Name (DSN) is a mismatch between the calling application and the installed driver version.
Match Your Application: If your client app (e.g., older Microsoft Excel installations) is 32-bit, you must use the 32-bit driver and configure it via C:\Windows\SysWOW64\odbcad32.exe.
Use 64-Bit for Modern Tools: Modern platforms like Power BI Desktop require the 64-bit PostgreSQL driver, configured via the standard 64-bit Administrator tool in C:\Windows\System32\odbcad32.exe.
Hybrid Environments: For development stacks like SSIS (which develop in 32-bit but execute production in 64-bit), install both architectures on the developer machine. 🌐 2. Fix Network Security & Server Access
If the driver fails to locate or ping the host entirely, the obstruction lies in the network layer or the database settings.
Open Server Ports: Ensure PostgreSQL is listening on port 5432 (the default) and that local firewalls or security groups permit incoming traffic.
Modify postgresql.conf: By default, PostgreSQL only listens to local loops. Open your server’s configuration file and verify that listen_addresses is set to accept connections: listen_addresses = ‘*’ Use code with caution.
Authorize Client IPs (pg_hba.conf): Ensure the client machine’s IP address range is explicitly allowed to authenticate. After editing, apply a reload command like pg_ctl reload or execute SELECT pg_reload_conf(); to commit the changes without restarting the database. 🔐 3. Address Driver Corruption and DLL Conflicts
If you encounter random crashes, missing driver parameters, or ERROR_INVALID_ORDINAL errors, your installation may be corrupt or experiencing path conflicts. Solved: PostGreSQL connection – Qlik Community – 199352
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