We face this issue[1] if we send different version of soap message to a soap service endpoint. Check the service endpoint is soap 1.1 or 1.2 and send the right message.
[1]System.Web.Services.Protocols.SoapException: Server did not recognize the value of HTTP Header SOAPAction: urn:process.
at System.Web.Services.Protocols.Soap11ServerProtocolHelper.RouteRequest()
at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
