There is a known error that occurs in Microsoft SQL Server Management Studio that you may be experiencing when connecting to an MSSQL 2012 database externally.
In MSSQL Server Management Studio, when right-clicking on an MSSQL 2012 database and selecting 'Properties' - you will see the following error stating that "the user does not have permission to perform this action":
This error results from a design change to SQL Server 2012, and Microsoft has released a hotfix to correct the problem as well as several others.
If you are experiencing the error above when you try to view the properties of a database in a SQL Server 2012 instance, then please see the following resources from the Microsoft Support site:
Description of the Cumulative Update Package 2 for SQL Server 2012
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