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Source: Microsoft Support
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When Microsoft Internet Information Services 7.0 (IIS) server is configured to work in shared configuration mode then configuration files are stored on a file share. This is the recommended configuration for setting up web farms. However, in case file share goes offline, the entire set up fails and web servers stop responding. Moreover, when the file share comes up again, the IIS server is not able to detect it and you receive the following error message:
HTTP Error 500.19 - internal server error
The requested page cannot be accessed because the related configuration data for the page is invalid.
We have to do an IISreset to start the web servers again after this.
To resolve this issue set up a shared configuration with offline files (client side caching) enabled. To do this, follow these steps:
1. On the Web server, in Control Panel, open Offline Files.
2. In the Offline Files dialog box, click Enable Offline Files. Do not restart the machine yet.
3. Ensure that the cache is set to read only by running the following command:
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