1. Very few minitues ago, Active cluster node for SQL service was hung. So I power down manually.
2. Confirmed that SQL Service was transitted to passive node normally
3. Another servers operating IIS also shown the same randomlly
4. The latest changes on to those server is only applying MS security patch released August.
5. Confirmed that no changes with hardware components.
6. No pretty much usage for DATABASE.
Is there any tools or method to figure out why or trace why it happens on to those servers.