---
title: "TLS"
---
== TLS

=== Alert codes

0:: Close notify
10:: Unexpected message
20:: Bad record MAC
21:: Decryption failed
22:: Record overflow
30:: Decompression failed
40:: Handshake failed
41:: No certificate (SSL 3.0)
42:: Certificate is bad
43:: Certificate is not supported
44:: Certificate was revoked
45:: Certificate is expired
46:: Unknown certificate
47:: Illegal parameter
48:: CA is unknown
49:: Access was denied
50:: Decode error
51:: Decrypt error
60:: Export restriction
70:: Error in protocol version
71:: Insufficient security
80:: Internal error
86:: Inappropriate fallback
90:: User canceled
100:: No renegotiation is allowed
109:: An extension was expected but was not seen
110:: An unsupported extension was sent
111:: Could not retrieve the specified certificate
112:: The server name sent was not recognized
115:: The SRP/PSK username is missing or not known
116:: Certificate is required
120:: No supported application protocol could be negotiated

Source: https://www.gnutls.org/manual/html_node/The-TLS-Alert-Protocol.html