With credit to the Smartsite Helpdesk, add a headermapping key, old style, to the Smartsite Site Registry, with a name formatted as follows:
in which you need to replace <domain> with 1 of 3 possibilities:
- The machine name, in case of a testing / development environment
- The text "localhost", in case the only person to access that machine is you, via the machine itself
- The fully qualified domain name to the web site (like smartsite.livejournal.com), in case of a production environment.
Within that key, add a string value named 'ch' with a value of 'MGR'.