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Informix Error -41005

-41005 Error in reading the [INET_PROTOCOL] section of the INFORMIX.INI file.

Check the [INET_PROTOCOL] section of the INFORMIX.INI file to make sure this section has the following section heading:

[INET_PROTOCOL]

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-41005 fires when the legacy IBM Informix NET for Windows client can't read the [INET_PROTOCOL] section of INFORMIX.INI — per the official guidance.

  1. The INFORMIX.INI file missing the [INET_PROTOCOL] section heading, per the official guidance — the direct, only cause.
Solutions / Resolution
  1. Confirm the [INET_PROTOCOL] section heading is present in INFORMIX.INI, per the official guidance, exactly as [INET_PROTOCOL].
Examples
The required section heading
[INET_PROTOCOL]
tcpip=INETWSOK.DLL
Diagnostic Checks
  1. Open INFORMIX.INI and confirm the [INET_PROTOCOL] heading is present and correctly spelled, adding it if missing.
Related Errors / Related Topics
  • -41006 — "Protocolname is not in the [INET_PROTOCOL] section of the INFORMIX.INI file." A related [INET_PROTOCOL] configuration error, on a missing matching protocol entry rather than the section heading itself.

The [INET_PROTOCOL] section heading is missing from INFORMIX.INI — add it.