When installing an Xsan configuration profile in Yosemite, the following message may appear:
A server administrator username and password are required to join SAN "Yosemite SAN".
If you enter an invalid username and password, profile installation does not complete and you see this alert message:
Profile installation failed.
Unable to open proxy session
To resolve this issue, enter the username and password for an administrative user on your Xsan metadata controller (MDC). If your Xsan has more than one MDC, use the admin username and password of the first MDC listed in the profile's "Configuration Servers" list.