IIS 7.5 Unable to write configuration file

Question

I have a fault regarding IIS 7.5 on Win Server 2008 R2, whenever I try to change any site bindings or start an application pool I get the error below:

Filename: \\?\C:\Windows\system32\inetsrv\config\applicationHost.config
Error: Cannot write configuration file

the application pools run as network service. None of the sites that are running have been affected however their configuration cannot be changed

UPDATED 05/10/2012

A reboot fixed this issue, however I am curious to know what caused it in the first place.

UPDATE 09/04/2013 The server is no longer in production.

Solution 1

I had the same problem - turned out we'd just run out of disk space.

Solution 2

App Fabric can cause a Issue like that:

http://forums.iis.net/t/1178705.aspx/1

Comments

[flumeware]

Yes the permissions where fine, but I am still interested in any answers as to the cause.

[Alexander Puchkov]

In my case, the server had run out of free space, and freeing up space fixed the problem.