The Fusion Application Pool stopped with errors in the Event Viewer (i.e. the application pool 'Fusion' is being automatically disabled due to a series of failures in the process(es) serving that application pool). Warnings will also be displayed underneath the Error Level log entry.
These errors are indicators that Fusion and SharePoint are installed on the main domain server that is hosting both Fusion and SharePoint. Currently, errors only occurred on Windows Server 2012 R2.
The spnativerequestmodule.dll can only be run by one application at a time. By adding the preCondition="bitness64" line to applicationhost.config it only allows SharePoint to access the spnativerequestmodule. This allows both the Fusion and SharePoint application pools to run at the same time. The applicationHost.config can be located here in Server 2012 R2: C:\Windows\System32\inetsrv\config.
Ensure that you backup the original applicationHost.config before editing it.
<add name="SPNativeRequestModule" image="C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\isapi\spnativerequestmodule.dll" preCondition="bitness64" />
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