Over the last while I've been tearing what little is left of my hair out trying to authenticate with a web service using Domino. I need to put it down here so I don't forget but hopefully it will be of use to someone else too. When creating a Web Service Consumer, Domino creates the code for you based on the WSDL The extra piece in the jigsaw is as follows: //Code generated by Domino Sub NEW Call Service.Initialize (" somethingorother ", _ " somethingorother .Domino", "http:// somethingorother/somethingorother ?OpenWebService", _ " somethingorother ") //Code generated by Domino //Credential Code Call Service.setCredentials( "Username", "Password" ) //Credential Code //Code generated by Domino End Sub //Code generated by Domino You can find this in the lsxsd.lss file Looks like it's only for 8.5. I've tried to hack it to work in 8 but to no avail so far