I tried to override the <legacyImpersonationPolicy> Element, so a single application, will enable this policy (which is necessary, since this application breaks if disabled).

So my Framework64/aspnet.config states:

<configuration>
    <runtime>
        <legacyUnhandledExceptionPolicy enabled="false" />
        <legacyImpersonationPolicy enabled="false" />
        <alwaysFlowImpersonationPolicy enabled="false" />
        <SymbolReadingPolicy enabled="1" />
        <shadowCopyVerifyByTimestamp enabled="true"/>
    </runtime>
    <startup useLegacyV2RuntimeActivationPolicy="true" />
</configuration>

And a local aspnet.config file has this change:

<legacyImpersonationPolicy enabled="false" />

Procmon tells me the file is read by the w3wp.exe, but the settings will not apply. Can anyone point out a way how to correctly override the setting?

*The Server has been restarted meanwhile, but still no changes.