Analysis Services not allowing other/remote connections other than localhost
We always run our Analysis Services on a named server, e.g. AnSrv123, and being run by a Domain Login such as DomainName\ManageAnSRV124.

Regarding connecting to Remote Analysis Servers using SQL Server authentication please note the following.

Connect from client applications (Analysis Services)
https://msdn.microsoft.com/en-us/library/dn141153.aspx

This says, in part: "Authentication is always Windows authentication, and the user identity is always the Windows user who is connecting via Management Studio."