KB948109 SQL Server 2005 SP2 Security Upgrade Fails To Install

Man, being trying to install this on a server for while now and it keeps failing. The log reads:

SQL Server not responsive prior to running Repl post script procedure

So it turns out that if an SQL 2005 instance doesn’t use Windows Authentication for SQL login then the patch will fail to apply. How can you find out which instance is causing the problem? Use the management tools (or download the free Microsoft SQL Server Management Studio Express) and then try attaching to each instance individually using the Windows Authentication. Find one that doesn’t, then there’s your culprit.