- Your fire wall must be configured to allow Time Sync (we need Port 13 and we cycle among time servers, the top two being 18.104.22.168 and 22.214.171.124).
- Your computer time should not differ from the US Navy Atomic Clock time by more than 1 hour or mCalReader will inform you.
Determining your EWS URL
For on-premises Exchange, the EWS URL formula is HTTPS://CAS_server/EWS/Exchange.asmx
In ON-PREMISES you will usually have your IIS set for Windows Authentication (see http://technet.microsoft.com/en-us/library/gg247612.aspx for more details). This is also the default in hosted Exchange. Should you need to change this you may do so in the _Config_XML file by changing the HTTPAuthType parameter (options are Basic, Negotiate, ntlm, and Kerberos)
NB: You hear us talking about Exchange being a moving target in a migration. That’s true here. The default is Negotiate in Exchange 2013, and Basic in Exchange 2007 and 2010.
For Office 365 it is: