So if you really think that it is only a problem of compatibility I can install Windows Server 2012 is that OK ?

Thanks Roberto

This is the version that I'm using on a windows Server 2008 R2

More info:

if I try this command

<?php

$opcServer = "opc.tcp://188.22.19.200:49320/";
$opcPath = 'nsu=KEPServerEX;ns=2;s=GHOST.RHB1';

$client = new \COM("OpcLabs.EasyOpc.UA.EasyUAClient");

try {
$nodeElements = $client->BrowseDataNodes($opcServer, $opcPath);
} catch (\Exception $e) {
die($e->getMessage());
}


this code fire error
Source: OpcLabs.BaseLib
Description: Attempt to add existing item into a set.

same in this way:

script give same error if you change parameters to

$opcServer = "opc.tcp://pop.bitween.com:49320";
$opcPath = 'nsu=KEPServerEX;ns=2;s=RHB1.RHB1';

but works fine from test server , so looks like it depends on windows server version ??
or some components outdated ?

We have tested the procedure on a KEPWARE Server test and all worked but when we move to the official Server and we try to get node with this command:

$nodeElements = $client->BrowseDataNodes($opcServer, $opcPath);

we get this issue and we have no idea why can somebody explain why ?

Source: OpcLabs.BaseLib
Description: Attempt to add existing item into a set.