No idea, could be worth a try. Most of the times though, when instance A changes something about its characteristics (e.g. from http to https, ...) the other instances B1, B2 ... have troubles (because of the DBs of the Bs having "old" info about A still) like this: http://federation.skilledtests.com/Statusnet_problems.html#if_above_2_methods_didn.27t_help