Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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SELECT tblCustomer.ID , C2.colour FROM tblCustomer (NOLOCK) JOIN tblColour AS C2 ON tblCustomer.ID = C2.IDCustomer JOIN (SELECT C1.IDCustomer, MAX(C1.timestamp) AS MaxTime FROM tblColour AS C1 GROUP BY C1.IDCustomer) AS T1 ON (T1.MaxTime = C2.timestamp) AND (T1.IDCustomer = C2.IDCustomer)
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