If you want to check if a WMS service is available you can test with a request from your browser.

Find out the address to the WMS service in ArcCatalog:

Use parameters to alter the result:
LAYERS= specify the layer you want to view
SRS= specify the coordinate system
WIDTH/HEIGHT= number of pixels on your screen
BBOX= lower x, lower Y, upper X, upper Y coordinates


 Added  Fri Nov 10 10:29:02 CET 2017   by MatsEmbedded Image