I have a customer that is having their user intermittently receiving a 9010 error when they try to log in.  Then after about 10 minutes, the issue resolves itself.

They are on Rio and using Windows Authentication.  While it does resolve itself, it is a big irritant when they cannot access their records when they need to.  They want to figure out what is causing the problem so that it can be resolved.  To track this down, what monitors need to be add to trace server side performance?  They want to initiate tracing both client side and server side while they are experiencing the issue to try to narrow down what is happening, but I do not know what should be monitored.  Any help/suggestions are welcome.