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Unable to Connect to APEX: ORA-12537 (Doc ID 413525.1)

Last updated on FEBRUARY 09, 2023

Applies to:

Oracle REST Data Services - Version 1.1.0 and later
Oracle Application Express (APEX) - Version 1.5 and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


APEX has been installed and configured according to the instructions in the HTML DB / Application Express installation guide, and has been configured with an HTTP Server  or with Oracle REST Data Services (ORDS).

When running the URL http://servername:7777/pls/apex, a "Page cannot be displayed" error occurs.

A review of the error_log shows the following:


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