SOAP Endpoint - Unauthorized Errror

I am trying to invoke a workflow through a SOAP endpoint, using PHP, LiveCycle ES.

Are there any settings I need ....... to make the SOAP endpoint receive
WSDL connection requests ?

Thanks in advance.

The error I get is

SoapFault Object
(
[message:protected] =>
[string:private] =>
[code:protected] => 0
[file:protected] => /home/rob/scripts/soap_example.php
[line:protected] => 21
[trace:private] => Array
(
[0] => Array
(
[function] => __call
[class] => SoapClient
[type] => ->
[args] => Array
(
[0] => invoke_Async
[1] => Array
(
[0] => Array
(
[entityid] => 6752
)

)

)

)

[1] => Array
(
[file] => /home/rob/scripts/soap_example.php
[line] => 21
[function] => invoke_Async
[class] => SoapClient
[type] => ->
[args] => Array
(
[0] => Array
(
[entityid] => 6752
)

)

)

)

[faultcode] => soapenv:Server.Unauthorized
[detail] => stdClass Object
(
[hostname] => VM-ADOBE02
)

)