The Template Persistent Cache initialization & IIS Application Pool

A quite funny monday morning. Our network police, Mr.Pais rushed to the desk with his lappy and wooed, finding a strange issue with IIS application pool. Obvious, he wont stay cool until and unless finds a solution. The brainstomer had given a glimspe of the error message the Event Viewer had been throwing for the last whole week. He observed the issue was registering in the log every morning before the office hour starts. Here is the event viewr log.

Event Type: Error
Event Source: Active Server Pages
Event Category: None
Event ID: 5
Date: 14/05/2004
Time: 4:32:55 AM
User: N/A
Computer: 001DC001
Description:

Error: The Template Persistent Cache initialization failed for Application Pool 'DefaultAppPool' because of the following error: Could not create a Disk Cache Sub-directory for the Application Pool. The data may have additional error codes..

Googleoscoped the solution, suggested him the workaround.

A. Add the NT AUTHORITY\NETWORK SERVICE account to
C:\WINDOWS\Help\iisHelp\common with "Read and Execute," "List Folder Contents" and "Read".

B. Add the NT AUTHORITY\NETWORK SERVICE account to
C:\WINDOWS\system32\inetsrv\ASP Compiled Templates with Full Control.

C. Add the NT AUTHORITY\NETWORK SERVICE account to
C:\WINDOWS\IIS Temporary Compressed Files with Full Control.

Do an IIS Reset.

You know what, he never turned up saying the same. Issue must be solved. ;)

Service Unavailable error message when you browse a MOSS / WSS site or Central Admin.

IIS must be the reason for this. Do an IIS reset and see. If the problem persists, Just check the farm administrators password which has been set on the Application Pool.
To see this, go to Application Pool of both your site and the Central Administration site and right click to see the properties. Go to Identity tab and see the account name.

Make sure that the password is latest. If your network policy is defined some password expiration policy, you must have changed the password of the farm admin's domain password. Some times this to be reset in the Application Pool also. Do it for all the application pools of the sites which are not running and saying 'Service Unavailable'.
Give the new password in the identity tab and reset the iis.
run>cmd> iisreset
Hope it works fine now.