This might get long

I have a .Net/JSP application running on IIS7.5 & JBoss 4.05.  JBoss communicates with IIS via web services through GSOAP internally and has an external web site.  The primary user interface is accessed from IIS.  I have implemented ARR 2.5 on IIS7.5 as a load balancer for the IIS user interface and internal calls between the two web platforms, JBoss is a stand alone server.  Following shows webFarm, diskCahce and rewrite configuration:

    <webFarms>
        <webFarm name="stgitsm.serena.com" enabled="true">
            <server address="10.122.156.116" enabled="true">
                <applicationRequestRouting weight="100" />
            </server>
            <server address="10.122.156.117" enabled="true">
                <applicationRequestRouting weight="100" />
            </server>
            <applicationRequestRouting>
                <loadBalancing algorithm="WeightedTotalTraffic" />
                <affinity useCookie="true" />
                <protocol>
                    <cache enabled="false" validationInterval="01:40:00" />
                </protocol>
            </applicationRequestRouting>
        </webFarm>
        <applicationRequestRouting>
            <hostAffinityProviderList>
                <add name="Microsoft.Web.Arr.HostNameRoundRobin" />
                <add name="Microsoft.Web.Arr.HostNameMemory" />
            </hostAffinityProviderList>
        </applicationRequestRouting>
    </webFarms>

        <diskCache>
            <driveLocation path="C:\ARR_Cache" maxUsage="2" />
            <compression>
                <add mimeType="text/*" enabled="true" />
                <add mimeType="message/*" enabled="true" />
                <add mimeType="application/x-javascript" enabled="true" />
                <add mimeType="application/javascript" enabled="true" />
            </compression>
        </diskCache>
        <rewrite>
            <globalRules>
                <rule name="ARR_CacheControl_0468f3da-a29f-42a1-a176-49c929a16eaa" enabled="true" patternSyntax="Wildcard">
                    <match url="*.css" />
                    <serverVariables>
                        <set name="ARR_CACHE_CONTROL_OVERRIDE" value="1,max-age=28800" />
                    </serverVariables>
                </rule>
                <rule name="ARR_CacheControl_0815a267-ae07-4ce6-8029-a44037680648" enabled="true" patternSyntax="Wildcard">
                    <match url="*.js" />
                    <serverVariables>
                        <set name="ARR_CACHE_CONTROL_OVERRIDE" value="1,max-age=28800" />
                    </serverVariables>
                </rule>
                <rule name="ARR_CacheControl_41c08262-f68b-4f75-81a5-2140613b2800" enabled="true" patternSyntax="Wildcard">
                    <match url="*.jpg" />
                    <serverVariables>
                        <set name="ARR_CACHE_CONTROL_OVERRIDE" value="1,max-age=28800" />
                    </serverVariables>
                </rule>
                <rule name="ARR_stgitsm.serena.com_loadbalance_SSL" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
                    <match url="*" />
                    <conditions>
                        <add input="{HTTPS}" pattern="on" />
                    </conditions>
                    <action type="Rewrite" url="https://stgitsm.serena.com/{R:0}" />
                </rule>
                <rule name="ARR_stgitsm.serena.com_loadbalance" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
                    <match url="*" />
                    <action type="Rewrite" url="http://stgitsm.serena.com/{R:0}" />
                    <conditions>
                    </conditions>
                </rule>
            </globalRules>
            <rewriteMaps>
                <rewriteMap name="ARR_aeinternal.serenaondemand.com" />
            </rewriteMaps>
        </rewrite>

I have two issues:

1. When disk caching is enabled .css files are opened in Notepad instead of the browser.
2. I get HTTP 502 errors the first few times the user interfaces is accessed after a reboot or a few hours of no use, as if ARR is not able to access the server farm.  After a few attempts (2-10) the pages are loaded and it will be stable if the site is activly in use.  I can deal with this but the internal communications between IIS and JBoss is another story.

So what I am trying to solve is:

1. How do I configure ARR to handle .css (or any other file type) correctly?
2. What cause the 502 errors?

I do have failed request tracing enabled and can make those available if requested.

Any assistance and/or insight is greatly appreciated,

Cheers,

Fred