We have configured our salesforce.com crm sandbox with SSO and My Domain so that going to
<companyname>--dev.my.salesforce.com automatically redirects the users to our custom login page where they use our company issued credentials to log into salesforce crm.
The problem is that I would like to have our users go to a more friendly url. i.e. salesforce.ourcompany.com. When they hit this url it would automatically direct to
<companyname>--dev.my.salesforce.com and show our custom login page. We are just setting up a simple CName alias in our internal DC (for testing) but when we do this, we always are redirected to the actual sandbox instance.
Any ideas on how to setup a simple CName to do this or is there a salesforce configuration step I'm missing?