Unable to Connect to APEX: ORA-12537

(Doc ID 413525.1)

Last updated on JANUARY 19, 2018

Applies to:

Oracle REST Data Services - Version 1.1.0 and later
Oracle Application Express (APEX) - Version 1.5 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:

[Tue Jan 30 14:47:43 2007] [warn] [client] read request line timed out
[Tue Jan 30 14:47:43 2007] [warn] [client] mod_plsql: Long running URL [/pls/apex/apex] timed out
[Tue Jan 30 14:47:43 2007] [error] [client] [ecid: 1170186161:,0] mod_plsql: /pls/apex/apex HTTP-503 ORA-12537
[Tue Jan 30 14:50:57 2007] [warn] [client] mod_plsql: Long running URL [/pls/apex/apex] timed out




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