Home > SharePoint Problems/Issues > Fixing the Unable to connect publishing custom string handler for output caching. IIS instance id [id] Server Error

Fixing the Unable to connect publishing custom string handler for output caching. IIS instance id [id] Server Error

If you are getting “Unable to connect publishing custom string handler for output caching“ error in your event log  on your SharePoint server then it is because of a custom web service you have installed on your Sharepoint server. Reason for this error is that you have a web part or custom SharePoint application on your portal page which uses the custom web service.  Since Sharepoint uses output caching for the web pages to optimize the rendering experience and fast delivery of unchanged pages therefore, publishing infrastructure of Sharepoint tries to access the web service through your web part and due to any issue in your service, it starts generating this error. 

To fix this problem.

Edit the web.config  file of  your custom web service (DO NOT edit your Sharepoint Web application web.config) and make sure you have following under httpModules node which is located under system.web node.

<remove name=“PublishingHttpModule“ />

Save and close the web.config file.  Check your event logs on the SharePoint server (you might have to refresh) you should no longer see this event.

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