Event ID - 14172

Event Id14172
SourceMicrosoft Web Proxy
DescriptionCache failed to initialize properly. All cache drives failed to initialize properly. Caching will be disabled. The error code in the Data area of the event properties indicates the cause of the failure. (internal code 503.329.3.0.1200.50). Identify the specific reason for failure from previous relevant event logs. Fix the problem and restart the Web Proxy service to enable caching. Data: 0000: 000013ae
Event InformationCAUSE :
This behavior may occur if the partition on which the cache is located does not have the appropriate user rights for the Everyone user. The Everyone user must have full access rights to build the Urlcache folder during Setup, or if you change the partition and the cache must be moved. 
RESOLUTION:
To resolve this behavior: 
Start Windows Explorer, and the search for the Urlcache folder.
If the Dir1.cdat file is missing, change the rights for the Everyone user on the Urlcache folder to Full Control.
Restart all of the ISA Server services.
A file that is named Dir1.cdat is created. If the cache is located on only this partition, the file is the size of the cache that is defined in the ISA Server console. If other drives are defined in the cache configuration, there is an Urlcache folder on each drive that is defined. A Dir1.cdat file is created in each Urlcache folder.
Reference Links Events 14176 and 14172 Are Logged If the Urlcache Folder Does Not Have Correct Permissions

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