MSOLAP Provider used in connection string

We move asp page from live server to new setup server.
When asp page connect to our olap server, it show the below message:

Microsoft® OLE DB Provider for OLAP Services
error '80004005' OLAP server error: The operation requested failed due to security problems (the user could not be authenticated).

Our connection string as below and same with live server
provider=msolap;data source=servername;initial catalog=customer;user id=user;password=xxx;sspi=anonymous

After some Google and found this article by my colleague
How to check the MSOLAP Provider used in connection string

Some extraction of article as below:
MSOLAP ---Default Provider
MSOLAP.1 ---OLAP 7.0 Provider (msolap.dll)
MSOLAP.1 ---Analysis Service 2000 Provider (msolap80.dll)
MSOLAP.1 ---SSAS provider (msolap90.dll)

HKCR\MSOLAP ---is the default and used when MSOLAP is selected in the connection string, the file msolap.dll, msolap80.dll or msolap90.dll that is latest registered will be the default.
HKCR\MSOLAP.1 ---is the registry key for OLAP version 7, file msolap.dll
HKCR\MSOLAP.2 ---is the registry key for AS2000, file msolap80.dll
HKCR\MSOLAP.3 ---is the registry key for AS2005, file msolap90.dl


We change the connection string to
provider=msolap.3;data source=servername;initial catalog=customer;user id=user;password=xxx;sspi=anonymous
and it work