[Q] What's wrong with the OTA?

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http://forum.xda-developers.com – I flashed a couple roms on my Nexus S but didn't like them so wanted to go back to stock. So to make sure I get the original update I flashed 4.0.4 on it. I set my phone up and everything and got the notification that there's an OTA. Of course I let it install. Phone shuts down, starts installing, CWM asks me if I want to run the untrusted file, I select yes and get a Status 7 error. What could cause that? Is there a way I still can get 4.1.1 as an OTA or do I have to flash a 4.1.1 ROM? (HowTos)