diff --git a/include/sntl/errno.h b/include/sntl/errno.h
new file mode 100644
index 0000000..0572936
--- /dev/null
+++ b/include/sntl/errno.h
@@ -0,0 +1,48 @@
+/*
+ * Secure Network Transport Layer Library v2 implementation.
+ * (sntllv2) it superseed all versions before due to the:
+ * - memory consumption
+ * - new features such as pulse emitting
+ * - performance optimization
+ *
+ * This is a proprietary software. See COPYING for further details.
+ *
+ * (c) Askele Group 2013-2015 <http://askele.com>
+ *
+ */
+
+#ifndef __SNTL_ERRNO_H__
+#define	__SNTL_ERRNO_H__
+
+#define __SNTL_EPREFIX  200
+
+#define SNE_SUCCESS      200
+#define SNE_FAILED       201
+#define SNE_ENOMEM       202
+#define SNE_BADPROTO     203
+#define SNE_ENORPC       204
+#define SNE_EPERM        205
+#define SNE_TOOLONG      206
+#define SNE_EBUSY        207
+#define SNE_WOULDBLOCK   208
+#define SNE_LINKERROR    209
+#define SNE_NOSUCHMSG    210
+#define SNE_NOSUCHCHAN   211
+#define SNE_ETIMEDOUT    212
+#define SNE_IGNORED      213
+#define SNE_REPLYREQ     214
+#define SNE_RAPIDMSG     215
+
+/* some old errors for compatibility */
+#define ESXOREPLYREQ   SNE_REPLYREQ  /* protocol require reply with expression,
+                            * or expression return for the request */
+#define ESXOTIMEDOUT   SNE_ETIMEDOUT  /* timedout */
+#define ESXRCBADPROT   SNE_BADPROTO  /* invalid protocol */
+#define ESXNOCONNECT   SNE_LINKERROR  /* connection is lost */
+#define ESXNOCHANSUP   SNE_NOSUCHCHAN
+#define ESXRAPIDREPLY  SNE_RAPIDMSG
+
+const char *sntll_errno2cstr(int);
+
+#endif /* __SNTL_ERRNO_H__ */
+