I am not sure what you are having issues with, exactly. I have run DNN CE on multiple web heads in versions 4 and 5. Granted, DNN PE makes it a bit easier since it has a proper caching provider for this setup, but it is still possible in CE too. 

---

Chris Paterra

Get direct answers to your questions in the Community Exchange.

Thank you for your replies. Let me take a different tack by explaining the problem in more detail.

The symptoms:

When you add modules to a page they do not appear straight away. If you try and add the module again then either nothing happens again or both modules appear. You then go to delete the module extra module that has been added and then they both disappear. This goes on and is very annoying. Most editting actions have a similar effect. This only happens on DNN running on servers with Dual Core processors. I have tested this on multiple single and dual core servers.

What I think is the cause:

Each core has a separate page cache and it is alternating between them. DNN thinks the cache is up to date but may be retrieving the wrong information.

The fix in V4.0 of DNN:

Changing the EnableWebFarm option in web.config to true solved this problem and all was happy again. I found this fix in a forum post on this forum.

The problem in V5.0:

As the web farm support option has been disabled in DNN CE I now have the same problem back again. After searching the release notes and this forum I can not find another resolution to the problem.

Is there another work around for this problem, I have searched the release notes and this forum  and google so far.