The value of the WebDAV timeout cache in Windows® 7 is 60 seconds. In order to change the time out cache value, you will need to modify the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MRxDAV\Parameters\FileNotFoundCacheLifeTimeInSec registry key. This action is necessary because there is no mechanism in place that will flush the cache on demand.
Modifying the registry key
1. At the command prompt, run the Regedit command. This opens the Registry Editor.
2. Locate and then double click on the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MRxDAV\Parameters\FileNotFoundCacheLifeTimeInSec.
3. In the Edit DWORD (32-bit) Value dialog box, change the value in the Value data: text box to your desired value and click OK. The value of the WebDAV timeout cache has now been changed.