Coldfusion9 file not found exception when file exists

Hello,

We are receiving errors from Coldfusion9 in exception.log stating that files cannot be found when they exist. An example is below.

"Error","jrpp-99","02/11/11","12:47:01",,"File not found: /rewrite.cfm The specific sequence of files included or processed is: '''' "

coldfusion.runtime.TemplateNotFoundException: File not found: /rewrite.cfm

at coldfusion.filter.PathFilter.invoke(PathFilter.java:69)

at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:70)

at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28)

at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38)

at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:46)

at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38)

at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22)

at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62)

at coldfusion.CfmServlet.service(CfmServlet.java:200)

at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:89)

at jrun.servlet.FilterChain.doFilter(FilterChain.java:86)

at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:42)

at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46)

at jrun.servlet.FilterChain.doFilter(FilterChain.java:94)

at jrun.servlet.FilterChain.service(FilterChain.java:101)

at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:106)

at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)

at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:286)

at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:543)

at jrun.servlet.jrpp.JRunProxyService.invokeRunnable(JRunProxyService.java:203)

at jrunx.scheduler.ThreadPool$DownstreamMetrics.invokeRunnable(ThreadPool.java:320)

at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:428)

at jrunx.scheduler.ThreadPool$UpstreamMetrics.invokeRunnable(ThreadPool.java:266)

at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)

This seems to be happening a frequently as once every 40 minutes. Can anyone shed some light as to why this might be happening?

Thanks,

James