Webchat configured properly but not working getting below error in log file

Loggin in newly created customer
2013-10-16 13:32:42.379 +01:00   Nortel CIWebServices   28   0   Debug    None               Start of CustomerLogin WebMethod : Source : 172.30.1.11
2013-10-16 13:32:42.379 +01:00   Nortel CIWebServices   28   0   Debug    None               CustomerLogin WebMethod
username : 1381930362372@.
2013-10-16 13:32:42.383 +01:00   Nortel CIWebServices   28   2500   Info   None               http://windows-vsn6tjv/ccmmwebservices/CIUtilityWs.asmx : Customer Log In Successful for : 1381930362372@.
2013-10-16 13:32:42.383 +01:00   Nortel CIWebServices   28   0   Debug    None               End of CustomerLogin WebMethod
2013-10-16 13:32:42.384 +01:00   Nortel CIWebServices   28   2500   Info   None               http://windows-vsn6tjv/ccmmwebservices/CIUtilityWs.asmx : Customer Log In Successful for : 1381930362372@.
2013-10-16 13:32:42.384 +01:00   Nortel CIWebServices   28   0   Debug    None               End of GetAnonymousSessionKey WebMethod
2013-10-16 13:32:42.465 +01:00   Nortel CIWebServices   25   0   Debug    None               Start of ReadSkillsetByName WebMethod : Source : 172.30.1.11
2013-10-16 13:32:42.465 +01:00   Nortel CIWebServices   25   0   Debug    None               ReadSkillsetByName WebMethod
skillsetName : WC_Default_Skillset
2013-10-16 13:32:42.471 +01:00   Nortel CIWebServices   25   0   Debug    None               Start of ExceptionHandler.HandleException() v1
2013-10-16 13:32:42.471 +01:00   Nortel CIWebServices   25   2805   Crit   None               http://windows-vsn6tjv/ccmmwebservices/CISkillsetWs.asmx : Access Denied - Validation of session key failed
2013-10-16 13:32:42.471 +01:00   Nortel CIWebServices   25   0   Debug    None               Start of ExceptionHandler.RaiseException()
2013-10-16 13:32:42.471 +01:00   Nortel CIWebServices   25   2802   Major   None               http://windows-vsn6tjv/ccmmwebservices/CISkillsetWs.asmx : A Soap Exception Occurred - Details : <Error xmlns="http://webservices.ci.ccmm.applications.nortel.com"><ErrorNumber>2805</ErrorNumber><ErrorMessage>Access Denied - Validation of session key failed</ErrorMessage><ErrorSource>ReadSkillsetByName</ErrorSource></Error>
2013-10-16 13:33:59.457 +01:00   Nortel CIWebServices   12   0   Debug    None               Start of GetAnonymousSessionKey WebMethod : Source : 172.30.1.11
2013-10-16 13:33:59.457 +01:00   Nortel CIWebServices   12   0   Debug    None               Start of RegisterAnonymousCustomer WebMethod : Source : 172.30.1.11
2013-10-16 13:33:59.457 +01:00   Nortel CIWebServices   12   0   Debug    None               RegisterAnonymousCustomer WebMethod
Parameters :
CICustomerWriteType Object :
-------------------------------
title :
firstName :
lastName :
username : 1381930439458@.
-------------------------------

2013-10-16 13:33:59.462 +01:00   Nortel CIWebServices   12   2512   Info   None               http://windows-vsn6tjv/ccmmwebservices/CIUtilityWs.asmx : Registered New Customer with ID : 17
2013-10-16 13:33:59.462 +01:00   Nortel CIWebServices   12   0   Debug    None               End of RegisterAnonymousCustomer WebMethod
Returned : 17

I'd suggest that you verify your setup using the specified XAMPP version (v1,7.2) and work forward; there may be changes needed to use different versions of PHP and so on.