Hi,
If you navigate to http://XX:XX:XXX:XX:18001/webservice1/requestadapter.asmx?wsdl in a web browser, can you view the WSDL file? If so, then you know you have access to the WSDL file, so it probably is an issue with Visual Studio. If not, you need to talk to the web service owner and either fix the WSDL access or get a copy of the WSDL file. Also, you should try using the WCF-BasicHttp adapter instead of using a web reference. It is much more flexible than the SOAP adapter, with many more configuration options, and is generally less problematic than using web references. Here is a walkthrough: http://msdn.microsoft.com/en-us/library/bb246019.aspx.