diff -up yp-tools-2.12/src/yppasswd.c.adjunct yp-tools-2.12/src/yppasswd.c
--- yp-tools-2.12/src/yppasswd.c.adjunct	2012-04-23 13:17:47.000988833 +0200
+++ yp-tools-2.12/src/yppasswd.c	2012-04-23 13:18:01.209802938 +0200
@@ -449,7 +449,7 @@ verifypassword (struct passwd *pwd, char
 
   passwdlen = get_passwd_len (pwd->pw_passwd);
   if (pwd->pw_passwd[0] 
-      && 0 != strcmp (pwd->pw_passwd, "x") /* don't check shadow passwords */
+      && 0 != strcmp (pwd->pw_passwd, "##") /* don't check passwords using passwd.adjunct feature */
       && uid)
     {
       char *crypted = crypt(pwdstr, pwd->pw_passwd);