We upgraded our SQL cluster and readded it to a farm that has 3 WFE's
(one with index/central admin) and a SSRS box. From central admin, the
farm looks fine, with all the machines listed and all services accounted
for. For some reason, though, when a new web app/site collection is
added, the corresponding iis virtual directories are only added to the
index/central admin machine. Any ideas why that might happen?