sharepoint was unable to connect to the database server

Feb 1, 2012 at 10:40 AM

We have SP Installer, it works great in UAT server and it was working in Production also. Recently I tried to run an SP installer in Production and I starting getting a message in the "System Check" step 2 saying that "SharePoint was unable to connect to the database server." All sites are working on the farm. An ideas as to what might me going on?