The user does not have permission to perform this action.

Scenario:
We have created a new Login (ie: Test) and Login into this account and able to access the Databases.

When I try to execute DMVs like SYS.dm_exec_connections, The following Err occurred.

Msg 297, Level 16, State 1, Line 1
The user does not have permission to perform this action.

So, The login required some Server permission to access the DMVs. correct ?

Login into sa account and grant the following permission to login: test

USE master
GO
GRANT VIEW SERVER STATE TO [test]

The View Server State permission granted to the Test Login.

Now we can access the DMVs.