Initial email setup with EWS fails

I can't get email set up.  I enter in all the information and hit test. 

The "Contacting mailbox server" test spins for several minutes before giving me this error:

Failed to connect: URL is https://mail.ch.rmc/ews/exchange.asmx

Error Details:

DEBUG: setDebug: JavaMail version 1.4.5

DEBUG: getProvider() returning javax.mail.Provider[STORE,ews,com.solarwinds.mail.ews.EWSStore,SolarWinds,1.0]

could not auto-discover URL (null)

trying URL from host: https://mail.ch.rmc/ews/exchange.asmx

problem with URL: https://mail.ch.rmc/ews/exchange.asmx

I am able to successfully log in to OWA with the account.

I am able to browse to https://mail.ch.rmc/ews/exchange.asmx

The Alert Central server currently can't access the internet.  (I skipped that part of the setup but I don't know why this would cause email setup to fail.)

Ideas?