Application Event Log: Unable to connect publishing custom string handler for output caching.

We often get the following error in the eventlog on the SharePoint IIS Server:
Unable to connect publishing custom string handler for output caching.
It would be excellent to learn how to avoid this issue.

Googling the issue many refers to modifying web.config and either add or remove entries to the httpModule section.

• remove name="PublishingHttpModul"
• add name="OutputCache" type="System.Web.Caching.OutputCacheModule"

But what works? You tell me.

This blog most likely gives a great explanation of the issue. In SharePoint 2003 you had the concept of managed paths - so if you had other web applications on the server you needed to specify these explicit. In MOSS 2007 this feature is removed from the administration tool - and the above blog indicates that it should be added directly in web.config.