CRM Web Service and DNS

I was reminded of something today as I was helping a custom reconfigure a utility I wrote that was moved to a new server.

When you are using the CRM web services an specifying the server's name, you must use the actual name of the server.

If you attempt to access the web service by using the server's DNS address ( if it is different than the server's physical address ).  For example, here is how you would correctly access a CRM server using the web service:

Server Name: crmserver

Web Service Address: http://crmserver:5555/MSCRMServices

If, the server happens to have a DNS address of CRM, you could access the server using a web browser using the following URL:

http://crm

However, attempting to access the CRM web services using:

http://crm/MSCRMServices

will fail with an 401: unauthorized error.