I am having this problem too! My DSS server uses an LSI 9260-4i. I have tried 2 different Windows clients and both give the same error “Login failed : Exception while login!” when I try to login with username raid , password raid. I have disabled the firewall on the clients and everything.
Currently this is keeping me from being able to do RAID 10 online expansion, since without storage manager I would have to do the expansion from the WebBIOS (i.e. not online)