Hi, not sure the following traceback is enough, but I've the system still around and can provide more logs / info if needed. Adding one host, in the dialog select use foreman / satellite, disable the checkbox. An exception is reported on the top of the admin interface and in firefox console I see: Wed Dec 23 08:23:59 GMT+100 2015 SEVERE: Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: Exception caught: (TypeError) __gwt$exception: <skipped>: zab(...) is null at Unknown.ms(Unknown Source) at Unknown.us(Unknown Source) at Unknown.e3(Unknown Source) at Unknown.h3(Unknown Source) at Unknown.s2(Unknown Source) at Unknown.Im(Unknown Source) at Unknown.Sm(Unknown Source) at Unknown.g$(Unknown Source) at Unknown.Km(Unknown Source) at Unknown.Vm(Unknown Source) at Unknown.$Ve(Unknown Source) at Unknown.$Xe(Unknown Source) at Unknown.Yt(Unknown Source) at Unknown.au(Unknown Source) at Unknown._t/<(Unknown Source) at Unknown.anonymous(Unknown Source) Caused by: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) __gwt$exception: <skipped>: zab(...) is null at Unknown.ms(Unknown Source) at Unknown.us(Unknown Source) at Unknown.e3(Unknown Source) at Unknown.h3(Unknown Source) at Unknown.s2(Unknown Source) at Unknown.Im(Unknown Source) at Unknown.Sm(Unknown Source) at Unknown.g2(Unknown Source) at Unknown.N4e(Unknown Source) at Unknown.B$(Unknown Source) at Unknown.C2(Unknown Source) at Unknown.s2(Unknown Source) at Unknown.Im(Unknown Source) at Unknown.Sm(Unknown Source) at Unknown.g$(Unknown Source) at Unknown.Km(Unknown Source) at Unknown.Vm(Unknown Source) at Unknown.$Ve(Unknown Source) at Unknown.$Xe(Unknown Source) at Unknown.Yt(Unknown Source) at Unknown.au(Unknown Source) at Unknown._t/<(Unknown Source) at Unknown.anonymous(Unknown Source) Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) __gwt$exception: <skipped>: zab(...) is null at Unknown.s2u(Unknown Source) at Unknown.RHr(Unknown Source) at Unknown.hno(Unknown Source) at Unknown.xno(Unknown Source) at Unknown.n1u(Unknown Source) at Unknown.p2u(Unknown Source) at Unknown.RHr(Unknown Source) at Unknown.hno(Unknown Source) at Unknown.xno(Unknown Source) at Unknown.o4u(Unknown Source) at Unknown.s4u(Unknown Source) at Unknown.Tuk(Unknown Source) at Unknown.Zuk(Unknown Source) at Unknown.f2(Unknown Source) at Unknown.C2(Unknown Source) at Unknown.s2(Unknown Source) at Unknown.Im(Unknown Source) at Unknown.Sm(Unknown Source) at Unknown.g2(Unknown Source) at Unknown.N4e(Unknown Source) at Unknown.B$(Unknown Source) at Unknown.C2(Unknown Source) at Unknown.s2(Unknown Source) at Unknown.Im(Unknown Source) at Unknown.Sm(Unknown Source) at Unknown.g$(Unknown Source) at Unknown.Km(Unknown Source) at Unknown.Vm(Unknown Source) at Unknown.$Ve(Unknown Source) at Unknown.$Xe(Unknown Source) at Unknown.Yt(Unknown Source) at Unknown.au(Unknown Source) at Unknown._t/<(Unknown Source) at Unknown.anonymous(Unknown Source) com.google.gwt.event.shared.UmbrellaException -- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com