If Fusion Reactor is like SeeFusion, I have actually seen more examples of 
where the monitoring application is still available even when the CF Server 
does not seem responsive.  The most common cause of this is due to the CF 
server being out of active threads to respond to requests with due to DB locks, 
or other I/O locks on threads.  Since SeeFusion (and I assume Fusion Reactor as 
well) are implemented as a Java servlet filter they can usually manage to keep 
going even if CF is out of threads.

I believe what you are saying though-- so it sounds like something is locking 
up the whole JVM.  If memory looks good, I guess I would check for Hot Spot JVM 
crashes.   

First, check your out logs in <CFRoot>\runtime\logs\coldfusion-out.log
Next check for the existence of any file in <CFRoot>\runtime\bin\ that look 
like "hs_err_pidxxxx.log" where xxxx was the process id of the JVM when it 
crashed.

Also, you mentioned you were using CFX_Image.  Check this blog entry of Steven 
Erat's that discusses a very similar problem they had on a server using 
CFX_image.

http://www.talkingtree.com/blog/index.cfm?mode=entry&entry=B13095A3-45A6-2844-799942B3CBA5269E

~Brad

>> What does fusion reactor say is happening on the server
>> when it "stops". How many running threads are there?  How
>> many database calls are happening?  Get a full thread dump
>> and look at everything that is running.  What are you memory
>> levels?   Hard drive usage on the box? (perfmon)
>
>Unfortunately, FusionReactor runs in conjunction with the jrun process, so
>when ColdFusion locks up, FusionReactor is not accessible.  Memory and hard
>drive use appear normal whenever the lockups occur.  We've enabled request
>logging in FusionReactor so it writes the start and end of requests to a
>file so we will have something more to reference the next time it happens.
>
>I guess what I'm looking for specifically is any advice on additional
>metrics we can/should be collecting from the JVM (tools or JVM settings) or
>the ColdFusion service that might shed some light on what the system is
>doing when the lock occurs.
>
>
>-Justin 

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