Test Connection Failed in Ssis

I have access to server (SQL Server 2008R2) in database in MS, but I don't have it in SSIS. When I created Connection Manager (Native OLE DB), put server name and clicked "Test Connection", I gave:

TITLE: Connection Manager

Test connection failed because of an error in initializing provider. Login failed for user 'xxxxxxxxxxx'.

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OK

I have access to other servers and databases in SSIS. What could cause the problem?