Informix Error -79735: Can't instantiate protocol.

Reasons / Common Causes

-79735 fires when an internal error occurs during a connection attempt — per the official guidance. The live page also carries an informal note that the server could be down for this error and/or -79716.

1. An internal driver error during a connection attempt, per the official guidance — the direct, named cause.
2. The database server being down, per the official guidance's informal note — worth checking alongside -79716.

Solutions / Resolution

1. Call IBM Informix Technical Support, per the official guidance.
2. Check whether the database server is down, per the official guidance's informal note, since this and -79716 can both indicate that.

Examples

N/A

No specific triggering statement is documented beyond an internal connection-attempt error.

Diagnostic Checks

1. Confirm the database server is up, and escalate to IBM Informix Technical Support if it is and the error persists.

Related Errors / Related Topics

• -79716 — "System or internal error." A related error the official guidance's own informal note links to this code, both potentially indicating the server is down.

An internal error occurred instantiating the connection protocol — call IBM Informix Technical Support and check whether the server is down (see also -79716).