The new windows_updates.vbs which caches the results of the Windows Updates 
checks will minimise this, which seems to be caused by some internal corruption 
of the Software Servicing Store.

To clear down the CBS.log file, restart the windows modules installer service 
on the affected box, then run sfc /scannow, which will get rid of any 
undeletable cbs.log.persistxxxx files (which could be huge).

It's probably also worth running the latest System Update Readiness Tool 

Another symptom is large numbers of .cab files in c:\windfows\temp, so clear 
those out too.



Phil Randal
Infrastructure Engineer
Hoople Ltd | Thorn Office Centre | Hereford HR2 6JT
Tel: 01432 260415 | Email:

[] On Behalf Of Max Matslofva
Sent: 29 October 2012 08:23
Subject: Re: [Check_mk (english)] windows_update.vbs and CBS.log

I have a number of 2008 servers that I have problem with growing cbs.log with, 
but I have not seen the connection with windows_update.vbs.
But now that you mention it, it may be the servers that have the 
windows_update.vbs plugin that has the problem.


 [] För Marcel
Skickat: den 29 oktober 2012 08:12
Ämne: [Check_mk (english)] windows_update.vbs and CBS.log


I have been receiving reports that the plugin script windows_update.vbs 
generates entries in C:\windows\logs\cbs\cbs.log, causing the file to 
eventually grow to sizes of several gigabytes, specifically on 2008 servers.

Has anyone else had this issue?

Kind regards,

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