Workstation Failed Login

I started looking at the Failed Login Per Hour from a server Remote
Manager web interface and noticed that I have two workstation objects that
had failed to login about 300 times in one hour. Does anybody knows what
this means?
User: .CN=L2320-10_3_32_51.OU=workstations.OU=New_York.O=USA.T=USA _TREE.
Did anybody came accross this issue? Thank you.