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Kiwitrees should be able to work OK with either port 80 or 443, (see kiwitrees/includes/session.php lines 180-203) so there might be something else unusual at the server.

What does your phpinfo listing tell you about https settings (Administration > Site administration > Server information)?

Look particularly at these settings:
$_SERVER[‘REQUEST_SCHEME’]
$_SERVER[‘HTTP_REFERER’]
$_SERVER[‘HTTP_CF_VISITOR’]
$_SERVER[‘HTTP_X_FORWARDED_PROTO’]
$_SERVER[‘HTTPS’]

Nigel
My personal kiwitrees site is www.our-families.info