unable to add wms service to arcgis online

[Anonymous User]

I have been unable to add any of our WMS map service to arcgis online.  I have followed the tutorials exactly but when I go to add to ArcGIS Online, I get an error "Service " does not exist or is inaccessible.  What am I doing wrong?  

Here is the URL I'm using:

http://OCGIS3.ONSLOWNC.GOV:6080/arcgis/services/ParcelsOnly/MapServer/WMSServer?request=GetCapabilit...

Thanks!

[MicahBabinski]

I can't access it either. Are you sure their geoserver is still up and running?

[Anonymous User]

Yes, it is.  We have map services running that we can access in ArcGIS online through our rest services but recently we learned we need to use a wms service in order to access our map services through another vendor.  Our map services using the Rest URL is: https://ocgis3.onslowcountync.gov/rest/services/

The WMS services are suppose to be accessed using the url i posted above but it just won't work.....