HTTP Error 503 on IIS 7.5 after SP Install

Question

I have Windows 7 professional 32-bit with IIS 7.5 installed and configured. I installed the SP1 for Win 7 and since then the IIS is no more working. Even for simple queries like localhost/a.htm (where a.htm is a html file inside under c:\inetpub\wwwroot) leads me to the error:

HTTP Error 503. The service is unavailable.

The IIS worked fine up to SP1 (I have a lot of ASP.NET2/.NET 4 applications on it). I uninstalled the SP1, the same happens. What should I do?

Thanks.

Answer 1

I had this issue and it turned out to be that SP1 causes the "Load User Profile" setting on your Application Pools to be set to "True" causing IIS to use a Temp User Profile that doesn't have sufficient permissions.

To fix it I took the following steps:

1. Load up IIS
2. Click on Application Pools
3. Go to Advanced Settings
4. Scroll down to "Load User Profile" under the "Process Model" section
5. Set to "False"

Answer 2

The solution is provided here by squillman.

Sounds like your app pool(s) is/are not starting. Open IIS Manager and click on Application Pools, then check the Status column and make sure the all say Started (or at least your DefaultAppPool says Started). If it's not started, right-click on the app pool and choose Start. If you get an error let us know what it is.