Yes. When I said 443.. I meant I implicitly leave the port off.. knowing https is 443.
This WEBSSO/SAML2/SSOSSL redirect is related to some new changes in the SSO service of vCenter 6.0 perhaps ...
Have other people upgraded to vCenter 6.0, not using DNS, no AD integration, and can still reach their 6.0 vCenter without seeing this redirection based on hostname ?