Not to beat a dead horse, but if you are working with SharePoint and don’t know what the title of this post relates to, you need to educate yourself. If you have not run into an issue yet, just wait, you will.
- The usual scenario is “out of the blue” you can no longer browse your SharePoint site from the server desktop, though you can browse it fine from other machines on the network. You receive an access denied page.
- Your search crawls of SharePoint content fail with Access Denied.
- You begin to experience Access Denied errors in your custom code when you migrate the code from a single server (in my case a development server) to a multi server farm. The code runs perfectly in development and the permission in Dev are IDENTICAL to Production, the only difference is that production is a multi-server farm.
Of course I stated that this happens “out of the blue”, the reality is it happens after applying any Service Pack that implements the loopback check security feature in IIS. Once the update is applied and the server rebooted a long standing security hole is plugged and the result is any or all of the above. While the issue has been around for quite some time, I still run into folks who have not encountered it and are surprised that they are hit by it.
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