How do I solve the error:

Unable to read WSDL from URL: https://workflowtest.site.edu/_vti_bin/Lists.asmx?WSDL.
Error: 401 Unauthorized.

I can successfully view the WSDL from the browser using the same user account. I'm not sure which authentication is being used (Basic or Integrated).

How would I find that out?

The code making the call is:

<cfinvoke 
  username="username" 
  password="password"
  webservice="https://workflowtest.liberty.edu/_vti_bin/Lists.asmx?WSDL" 
  method="GetList" 
  listName="{CB02EB71-392E-4906-B512-8EC002F72436}"
>

The impression I get is that coldfusion doesn't like being made to authenticate to get the WSDL.

Full stack trace:

coldfusion.xml.rpc.XmlRpcServiceImpl$CantFindWSDLException: Unable to read WSDL from URL: https://workflowtest.liberty.edu/_vti_bin/Lists.asmx?WSDL.
  at coldfusion.xml.rpc.XmlRpcServiceImpl.retrieveWSDL(XmlRpcServiceImpl.java:709)
  at coldfusion.xml.rpc.XmlRpcServiceImpl.access$000(XmlRpcServiceImpl.java:53)
  at coldfusion.xml.rpc.XmlRpcServiceImpl$1.run(XmlRpcServiceImpl.java:239)
  at java.security.AccessController.doPrivileged(Native Method)
  at coldfusion.xml.rpc.XmlRpcServiceImpl.registerWebService(XmlRpcServiceImpl.java:232)
  at coldfusion.xml.rpc.XmlRpcServiceImpl.getWebService(XmlRpcServiceImpl.java:496)
  at coldfusion.xml.rpc.XmlRpcServiceImpl.getWebServiceProxy(XmlRpcServiceImpl.java:450)
  at coldfusion.tagext.lang.InvokeTag.doEndTag(InvokeTag.java:413)
  at coldfusion.runtime.CfJspPage._emptyTcfTag(CfJspPage.java:2662)
  at cftonytest2ecfm1787185330.runPage(/var/www/webroot/tonytest.cfm:16)
  at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:196)
  at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:370)
  at coldfusion.filter.CfincludeFilter.invoke(CfincludeFilter.java:65)
  at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:279)
  at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:48)
  at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40)
  at coldfusion.filter.PathFilter.invoke(PathFilter.java:86)
  at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:70)
  at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:74)
  at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)
  at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)
  at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:46)
  at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)
  at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)
  at coldfusion.CfmServlet.service(CfmServlet.java:175)
  at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:89)
  at jrun.servlet.FilterChain.doFilter(FilterChain.java:86)
  at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:42)
  at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46)
  at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)
  at jrun.servlet.FilterChain.service(FilterChain.java:101)
  at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106)
  at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
  at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:286)
  at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:543)
  at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:203)
  at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPool.java:320)
  at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:428)
  at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.java:266)
  at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)