diff --git a/source3/utils/testparm.c b/source3/utils/testparm.c
index e8458fd..f96400d 100644
--- a/source3/utils/testparm.c
+++ b/source3/utils/testparm.c
@@ -33,6 +33,34 @@
 
 #include "includes.h"
 
+#if defined(HPUX)
+/*****************************************************
+  Prevent uid and gid from negative numbers
+  If found invallid uid/gid for guest account, return 1.
+  Otherwise return 0.
+ *****************************************************/
+int check_valid_guestaccount() 
+{
+	struct passwd *pw;
+	fstring guser;
+	int ret=0;
+
+	fstrcpy(guser,lp_guestaccount());
+	pw=sys_getpwnam(guser);
+
+	if (!pw) {
+		fprintf(stderr, "ERROR: Not found the user %s as guest account from /etc/passwd\n", guser);
+		ret = 1;
+	} else {
+		if ( pw->pw_uid < 0 || pw->pw_gid < 0 ) {
+			fprintf(stderr, "ERROR: Invalid uid/gid as guest account = %s on global due to nagetive values\n", guser);
+			ret = 1;
+		}
+	}
+	return ret;
+}
+#endif
+
 extern bool AllowDebugChange;
 
 /***********************************************
@@ -211,6 +239,21 @@ via the %%o substitution. With encrypted passwords this is not possible.\n", lp_
 	}
 #endif
 
+#if defined(HPUX)
+	/*
+	 * Protect the valid user as guest account from negative uid and gid.
+	 * When guest account is set to a user with negative uid or gid,
+	 * we suggest Administrator to use smbnull as guest account for HP_UX
+	 * in smb.conf.
+	 */
+	if (check_valid_guestaccount()) 
+	{
+		fprintf(stderr, "Recommend: Please use smbnull as guest account on [global]\n");
+		fprintf(stderr, "           or change invalid uid/gid to positive numbers.\n\n");
+		ret = 1;
+	}
+#endif /* HPUX */
+
 	if (!lp_passdb_backend()) {
 		fprintf(stderr,"ERROR: passdb backend must have a value or be left out\n");
 	}