diff --git a/samples/chain/client.lua b/samples/chain/client.lua
index c728ea6..d85c8fb 100644
--- a/samples/chain/client.lua
+++ b/samples/chain/client.lua
@@ -7,7 +7,7 @@ local util   = require("util")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/chain/server.lua b/samples/chain/server.lua
index d8643e9..a560fbe 100644
--- a/samples/chain/server.lua
+++ b/samples/chain/server.lua
@@ -7,7 +7,7 @@ local util   = require("util")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/dhparam/client.lua b/samples/dhparam/client.lua
index 42a26b3..48bc0bb 100644
--- a/samples/dhparam/client.lua
+++ b/samples/dhparam/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/dhparam/server.lua b/samples/dhparam/server.lua
index e2f63a2..37661d5 100644
--- a/samples/dhparam/server.lua
+++ b/samples/dhparam/server.lua
@@ -31,7 +31,7 @@ end
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/digest/client.lua b/samples/digest/client.lua
index 42a26b3..48bc0bb 100644
--- a/samples/digest/client.lua
+++ b/samples/digest/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/digest/server.lua b/samples/digest/server.lua
index a0e7cac..9b4743f 100644
--- a/samples/digest/server.lua
+++ b/samples/digest/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/ecdh/client.lua b/samples/ecdh/client.lua
index 6877c0f..31bba7a 100644
--- a/samples/ecdh/client.lua
+++ b/samples/ecdh/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/ecdh/server.lua b/samples/ecdh/server.lua
index 31dc40a..058aef3 100644
--- a/samples/ecdh/server.lua
+++ b/samples/ecdh/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/info/client.lua b/samples/info/client.lua
index 42a26b3..48bc0bb 100644
--- a/samples/info/client.lua
+++ b/samples/info/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/info/server.lua b/samples/info/server.lua
index 64183c5..454abea 100644
--- a/samples/info/server.lua
+++ b/samples/info/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/loop-gc/client.lua b/samples/loop-gc/client.lua
index f0081c3..0503eae 100644
--- a/samples/loop-gc/client.lua
+++ b/samples/loop-gc/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/loop-gc/server.lua b/samples/loop-gc/server.lua
index f7a1ce2..a28c1f8 100644
--- a/samples/loop-gc/server.lua
+++ b/samples/loop-gc/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/loop/client.lua b/samples/loop/client.lua
index e35ef2a..7e5430d 100644
--- a/samples/loop/client.lua
+++ b/samples/loop/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/loop/server.lua b/samples/loop/server.lua
index 076c276..734ad1e 100644
--- a/samples/loop/server.lua
+++ b/samples/loop/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/oneshot/client.lua b/samples/oneshot/client.lua
index 42a26b3..48bc0bb 100644
--- a/samples/oneshot/client.lua
+++ b/samples/oneshot/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/oneshot/server.lua b/samples/oneshot/server.lua
index 562382f..b3bcd8d 100644
--- a/samples/oneshot/server.lua
+++ b/samples/oneshot/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/sni/client.lua b/samples/sni/client.lua
index 79eb004..5e50a72 100644
--- a/samples/sni/client.lua
+++ b/samples/sni/client.lua
@@ -3,7 +3,7 @@ local ssl    = require("ssl")
 
 local params = {
   mode = "client",
-  protocol = "tlsv1",
+  protocol = "tlsv1_2",
   key = "../certs/clientAkey.pem",
   certificate = "../certs/clientA.pem",
   cafile = "../certs/rootA.pem",
diff --git a/samples/sni/server.lua b/samples/sni/server.lua
index 101bc2f..2de6a8d 100644
--- a/samples/sni/server.lua
+++ b/samples/sni/server.lua
@@ -3,7 +3,7 @@ local ssl    = require("ssl")
 
 local params01 = {
   mode = "server",
-  protocol = "tlsv1",
+  protocol = "any",
   key = "../certs/serverAkey.pem",
   certificate = "../certs/serverA.pem",
   cafile = "../certs/rootA.pem",
@@ -14,7 +14,7 @@ local params01 = {
 
 local params02 = {
   mode = "server",
-  protocol = "tlsv1",
+  protocol = "any",
   key = "../certs/serverAAkey.pem",
   certificate = "../certs/serverAA.pem",
   cafile = "../certs/rootA.pem",
diff --git a/samples/verify/client.lua b/samples/verify/client.lua
index 8270c62..5207250 100644
--- a/samples/verify/client.lua
+++ b/samples/verify/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/serverBkey.pem",
    certificate = "../certs/serverB.pem",
    cafile = "../certs/rootB.pem",
diff --git a/samples/verify/server.lua b/samples/verify/server.lua
index 216c2cd..e11b36e 100644
--- a/samples/verify/server.lua
+++ b/samples/verify/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/want/client.lua b/samples/want/client.lua
index 813f310..8615387 100644
--- a/samples/want/client.lua
+++ b/samples/want/client.lua
@@ -8,7 +8,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/want/server.lua b/samples/want/server.lua
index b0fe220..6b63168 100644
--- a/samples/want/server.lua
+++ b/samples/want/server.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/wantread/client.lua b/samples/wantread/client.lua
index 1c13949..5e3a6ac 100644
--- a/samples/wantread/client.lua
+++ b/samples/wantread/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/wantread/server.lua b/samples/wantread/server.lua
index 5323e69..7f62bbc 100644
--- a/samples/wantread/server.lua
+++ b/samples/wantread/server.lua
@@ -8,7 +8,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/wantwrite/client.lua b/samples/wantwrite/client.lua
index f3e6479..ea60517 100644
--- a/samples/wantwrite/client.lua
+++ b/samples/wantwrite/client.lua
@@ -6,7 +6,7 @@ local ssl    = require("ssl")
 
 local params = {
    mode = "client",
-   protocol = "tlsv1",
+   protocol = "tlsv1_2",
    key = "../certs/clientAkey.pem",
    certificate = "../certs/clientA.pem",
    cafile = "../certs/rootA.pem",
diff --git a/samples/wantwrite/server.lua b/samples/wantwrite/server.lua
index 7b03891..ac31cc4 100644
--- a/samples/wantwrite/server.lua
+++ b/samples/wantwrite/server.lua
@@ -8,7 +8,7 @@ print("Use Ctrl+S and Ctrl+Q to suspend and resume the server.")
 
 local params = {
    mode = "server",
-   protocol = "tlsv1",
+   protocol = "any",
    key = "../certs/serverAkey.pem",
    certificate = "../certs/serverA.pem",
    cafile = "../certs/rootA.pem",