System goes down and back so only make a change in web.config

I have a system called BOS. The system crashes when 3, 4, 5 or more browsing the system.

The solution is to go into web.config, edit it (any modification, it may even 开发者_Go百科be a blank space) and save it again. And voila, the system returns.

My question is this? What are the possible causes that? What may be related to this? Code or Infrastructure? How to solve?

It's possible that it is only set up to handle around 5 simultaneous requests and it just becomes unresponsive at that point. Try going into your IIS settings and changing that if this is the case, although it's really hard to say with so little information provided. What do you mean by crashes? Internet Explorer crashes? IIS crashes? System just becomes unresponsive and new requests time out?

I would look under the Performance tab in IIS. You might have a maximum connection threshold or bandwidth threshold specified. Every time you modify the web.config file it restarts the application, which is why it starts working again.

If that doesn't work, I would maybe look at something like ANTS Performance Profiler or ANTS Memory Profiler. It will help to identify any bottlenecks that are causing your system to crash. It could be anything, but profiling tools might help to narrow down the culprits.