There is a number of things that could cause something like this to happen. The very first thing I would recommend would be to reboot the ML6000 and look for RAS tickets on the ML.
Hello i hope somone can help me in this case. We have ML6000 library running. Since today i can not longer login to ML6000 Web Client. I get the message: "The Library is busy. Unable to access." I checked the library doors. Library doors are closed. [IMAGE]How can i fix this issue? Thanks for all proposals.    
ML6000 Web Client issue. "The Library is busy. Unable to access."