Did anyone find a solution for this problem? – I’m experiencing the exact same problem on this type of BladeCenter / blade servers. We have got five HS20 (8843-21Y) blades in one BladeCenter (8677-3TG), and randomly either of the blades looses connection to the network. I don't know what type of ESM modules that are installed, but they appear as DLNK (revision 95 - released 08/20/2004) in MM web.