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Article ID: 128506, created on Mar 6, 2016, last review on Jul 14, 2018

  • Applies to:
  • Operations Automation 6.0
  • Operations Automation 5.5


When trying to open File Manager in CCP, most of the frames get loaded, but after several seconds the following error is displayed:

Unable to connect to backend

In some cases you may get these errors directly in the browser or in PHP error log:

PHP Notice:  Undefined index:  culture in C:\Program Files (x86)\SWsoft\PEM\sysvhosts\elFinder\index.php on line 63
PHP Notice:  Undefined offset:  0 in C:\Program Files (x86)\SWsoft\PEM\sysvhosts\elFinder\index.php on line 74


The issue is caused by outdated PHP version, e.g. 5.2.X, which has been EOL-ed since 6 Jan 2011.

Windows Webfilemanager uses several PHP methods, introduced only since version 5.3 (see POA 5.5 New Windows File Manager requirements).


Verify that PHP version on the Webfilemanager server is 5.3 or newer.

If you see that it is not, e.g

C:\Users\Administrator>php-cgi -v
PHP 5.2.17 (cgi-fcgi) (built: Jan  6 2011 17:28:40)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
    with the ionCube PHP Loader v3.1.32, Copyright (c) 2002-2007, by ionCube Ltd

update PHP version to 5.3.

5356b422f65bdad1c3e9edca5d74a1ae caea8340e2d186a540518d08602aa065 e12cea1d47a3125d335d68e6d4e15e07 956c448bddc7e1f3585373687602379f 6f1456866eed87488c0f02b298a741c0 5b048d9bddf8048a00aba7e0bdadef37 2554725ed606193dd9bbce21365bed4e

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