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> Yves, this problem is normally associated with the client and server > not being on the same version ( ie have you upgraded both the UI and > the CE to the same version of lcg-CA ?) That was my first thought although in the past they did not have to be updated so precisely in lockstep. But for some pathological reason, yum clean all is not cleaning /var/cache/yum/lcg-CA on SL4 UI & WN, & some 1.20 stuff squirrelled away in there causes yum update to fail with 1.20 dependencies. While I was investigating that (& as site goes orange & users log tickets!) I backed out of the 1.21 CE1+2/SE/MON update. Will do tomorrow. Hope it goes smoothly for us all.