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Editorial Team
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Asked: 2026-05-26T17:44:23+00:00

I recently released some code to our production website and I noticed that IIS

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I recently released some code to our production website and I noticed that IIS was logging some errors with the exception text of:

Multiple controls with the same ID ‘_ffffca417ddfd512’ were found. FindControl requires that controls have unique IDs.

I don’t have a stacktrace at this point. The page is mostly static content with a few link buttons and a bunch of user controls. Its also using the Sitecore 6.0 CMS framework (its a content item). I disabled the .net caching for the user controls and the page (layout) and that seems to have fixed it, but the site is pretty busy, and I would like to have some layer of caching.

My question is this a know issue in sitecore? And, should I only cache at the page level or the control level in sitecore?

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1 Answer

  1. Editorial Team

    This doesn’t seem to be a Sitecore specific issue – http://support.microsoft.com/kb/834608

    If you’re using it, turn off ASP.net output caching and use Sitecore caching, either inline:

    <sc:Sublayout runat="server" runat="server" Cacheable="true" VaryByData="true"/>

    …or…

    <sc:XslFile runat="server" runat="server" runat="server" Cacheable="true" VaryByData="true"/>

    …or in your presentation bindings at the template or item level, or on the sublayout or rendering definition item. The same caching options are available in all three locations.

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