Error Displaying Portlet

We are having trouble with portlets not displaying. If the portal has not been accessed by anyone for several minutes, it seems as though the portlet server is swapping out iis or the portlet application. The first time the portlet is requested after several minutes of inactivity, the processor on the portlet server spikes and iis uses a good bit of cpu. When I access the portlet through the portal, it errors the first time I request it. Subsequent requests work fine. I can access the portlet on the portlet server using Internet Explorer. IE waits the 10 seconds and then displays the portlet.
The error messages in ptspy are:
82 09-12 11:56:52 Warn WebDownloaderParallel.dll 5700 4048 WebDownloaderParallelCommon.cpp(34) Error in CPTHttpRequestParallel::get_Response. The request is not yet finished. The request failed to connect to the host for an unknown reason..84 09-12 11:56:52 Warn Gadget Providers 5700 4048 HttpGadgetProviderObject.cpp(875) Warning in CHttpGadgetProvider::raw_GetHTMLText : the response object could not be created. The error reported was 0x80044f6585 09-12 11:56:52 Warn Common Library 5700 4048 PTCommon.cpp(977) ***SetError *** (0x80044633): Error in CHttpGadgetProvider::raw_GetHTMLText, The Portal Server could not retrieve the content for this gadget because of a connection error with the host. If this problem persists, please alert a system administrator.

I am faced with the exact same issue: .png is not showed up inside the portlet. Removing the prefix URL gateway for the portlet web service would work.
However, in my case, my system is sitting behind a gateway to ensure a secure connection. I can NOT remove the prefix URL gateway on my system. It appears the problem is, if the portlet web service is prefix with a URL gateway, the PNG fie is delivered to the browser with the wrong MIME-type ("text/html" instead of "image/png").
My web service is deployed on a WebLogic container. Is this a configuration issue in AquaLogic/WebCenter Interactions?
Any help would be greatly appreciated. Thanks!

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Error Displaying Portlet

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