First of all, you do not need to configure SSAS for access through HTTP to connect to it from excel. Why are you doing this?
Secondly, the correct way to access the HTTP cube http://YOUR_SERVER/olap/msmdpump.dllif you upgrade to SSMS on machine 2 and let it know that this connection works?
Third and more important, where is IIS? In the same box as SSAS? If yes, great! If not, you need to set up keberos because you will be dealing with a double jump situation.
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