mongo2.6: db.serverStatus().connections nothing happened?
The userAdminAnyDatabase role does not grant access to run the serverStatus command. Your db.serverStatus() command is returning an authorization error and you are then referencing a non-existent connections property which results in the "no results to show" message.

You can confirm this by running db.serverStatus(), which should return something similar to the following if the current user is not authorized:

{
     "ok" : 0,
     "errmsg" : "not authorized on admin to execute command { serverStatus: 1.0 }",
     "code" : 13
}


To allow the serverStatus command you need to grant either a built-in role that includes this privilege (clusterMonitor or hostManager in MongoDB 2.6) or create a user-defined role if you want a more narrow scope.

For example, to create and grant a custom role to run serverStatus:

use admin
db.createRole({
    role: "serverStatus",
    privileges: [
        { resource: { cluster: true }, actions: [ "serverStatus" ] },
    ],
    roles: []
})

db.grantRolesToUser("superAdmin",["serverStatus"])