I have seen a similar error in this thread: http://social.technet.microsoft.com/Forums/en-US/sharepointadmin/thread/550eb241-b095-4976-ba19-29c557d9b36bHowever, my installation is complete and has been fine until recently. We had a maintenance weekend and I tried to run the config wizard as usual and I kept getting the error: An exception of type System.ArgumentException was thrown. Additional exception information: The IncomingUrl is already present in the collection in a different zone. A url may only map to one zone at a time. Use a different url for requests from this zone.My AAM looks like the following: (Some minor things have been changed for security reasons) Internal URLZonePublic URL for Zone http://it.gslive.com Default http://it.gslive.com http://it Intranet http://it http://gslive Default http://gslive http://gv1xxx02 Default http://gslive http://gslive.com Internet http://gslive.com http://gv1xxx01.bab.pvt Custom http://gslive.bab.pvt http://gslive.bab.pvt Custom http://gslive.bab.pvt http://gv1xxx01.bab.pvt:11111 Default http://gv1xxx01.bab.pvt:11111 http://gv1xxx01:11111 Intranet http://gv1xxx01:11111 http://mysite Default http://mysite http://mysite.gslive Intranet http://mysite http://mysite.gslive.com Internet http://mysite.gslive.com http://projects.gslive.com Default http://projects.gslive.com http://projects Intranet http://projects I am not sure what to change as far as the defaul zone goes. Any ideas? The above AAMs are from the Central Admin hosted on the xxx01 server. It is farmed with xxx02. Thank you!!