At work we have many SharePoint environments: each developer has their own, plus staging and production.
I went on a small crusade to standardize and sync the port which each environment’s Central Administration site used. I thought this might be difficult to track down and make all the changes, but it wasn’t stsadm to the rescue.
Just try this:
stsadm -o setadminport -port 100
– By Nik Molnar