diff --git a/backplane-auth.scm b/backplane-auth.scm
index f23ee80..8aa230a 100644
--- a/backplane-auth.scm
+++ b/backplane-auth.scm
@@ -8,12 +8,12 @@
 
 (define *host-passwd-file* (getenv "FUDO_HOST_PASSWD_FILE"))
 (when (not *host-passwd-file*)
-  (format (current-error-port "FUDO_HOST_PASSWD_FILE not set~%"))
+  (format #t (current-error-port "FUDO_HOST_PASSWD_FILE not set~%"))
   (exit 1))
 
 (define *service-passwd-file* (getenv "FUDO_SERVICE_PASSWD_FILE"))
 (when (not *service-passwd-file*)
-  (format (current-error-port "FUDO_SERVICE_PASSWD_FILE not set~%"))
+  (format #t (current-error-port "FUDO_SERVICE_PASSWD_FILE not set~%"))
   (exit 1))
 
 (define host-regex "^host-([a-zA-Z][a-zA-Z0-9_-]+)$")
@@ -35,7 +35,8 @@
            (service-verifier (match:substring (string-match service-regex username) 1)
                              password))
 
-          (else #f))))
+          (else (begin (format #t "unrecognized username: ~s @ ~s~%" username hostname)
+                nil)))))
 
 (define (make-handler handlers)
   (lambda (request)