Site Collection Template will not add to central admin
If you are trying to upload a Custom Site Template on your central administration site using the commands:
stsadm -o addtemplate -filename "devcowcustomv1.stp" -title "custom site template"
or
stsadm -o enumtemplates
You might get the error message "This web service does not support custom web templates." if the user you are running the command with does not have permissions to write to the database. This can happen if you have a machine for the central administration and a machine for the database.