+ 0 Votes DCOMConfig Tony Hopkinson 3 years ago The user name password verified at configurtaion time and from then on 'just works', stores the SID somewhere I believe. Now you've chnaged domains the SID, has changed... Got me when a long running erver was moved, just truning it of anf turnng it back on again broke it. Beccause the guy who set it up used his logon details and he'd left years ago and so been wiped. Run it up and the machine in question, it's pretty much self explanatory. + 0 Votes Resolved!!! bds_1959 3 years ago I found the problem - was one of the DCOM Component Services - had to add security for a group. Resolved! + 0 Votes dns to ip IT.vgomez 3 years ago make sure that the application is configure with the wright ip addresses and is identified by your dns as accessable ips. check firewall setting that the ne applications might need and provide specific naming portr forwading.