--- ypserv-2.19/rpc.yppasswdd/update.c	2018-08-22 12:28:08.745629282 +0200
+++ ypserv-2.19/rpc.yppasswdd/update.c	2018-08-22 12:28:36.424079754 +0200
@@ -604,7 +604,9 @@
 	      !((yppw->newpw.pw_passwd[0] == 'x' ||
 		 yppw->newpw.pw_passwd[0] == '*') &&
 		yppw->newpw.pw_passwd[1] == '\0') &&
-	      yppw->newpw.pw_passwd[0] != '\0')
+	      yppw->newpw.pw_passwd[0] != '\0' &&
+          !(yppw->newpw.pw_passwd[0] == '#' &&
+            yppw->newpw.pw_passwd[1] == '#'))
 	    {
 #ifdef HAVE_GETSPNAM /* shadow password */
 	      if (spw)