diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 0d7cb66..eaaacac 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -132,6 +132,8 @@
 #define DFL_FALLBACK            -1
 #define DFL_EXTENDED_MS         -1
 #define DFL_ETM                 -1
+#define DFL_SERIALIZE           0
+#define DFL_EXTENDED_MS_ENFORCE -1
 #define DFL_CA_CALLBACK         0
 #define DFL_EAP_TLS             0
 #define DFL_REPRODUCIBLE        0
@@ -411,6 +413,7 @@
     "                                configuration macro is defined and 1\n"  \
     "                                otherwise. The expansion of the macro\n" \
     "                                is printed if it is defined\n"     \
+    "    serialize=%%d        default: 0 (do not serialize/deserialize)\n" \
     " acceptable ciphersuite names:\n"
 
 #define ALPN_LIST_SIZE  10
@@ -483,6 +486,7 @@
     int cid_enabled_renego;     /* whether to use the CID extension or not
                                  * during renegotiation                     */
     const char *cid_val;        /* the CID to use for incoming messages     */
+    int serialize;              /* serialize/deserialize connection         */
     const char *cid_val_renego; /* the CID to use for incoming messages
                                  * after renegotiation                      */
     int reproducible;           /* make communication reproducible          */
@@ -1186,6 +1190,7 @@
     opt.extended_ms         = DFL_EXTENDED_MS;
     opt.etm                 = DFL_ETM;
     opt.dgram_packing       = DFL_DGRAM_PACKING;
+    opt.serialize           = DFL_SERIALIZE;
     opt.eap_tls             = DFL_EAP_TLS;
     opt.reproducible        = DFL_REPRODUCIBLE;
 
@@ -1574,6 +1579,12 @@
         {
             return query_config( q );
         }
+        else if( strcmp( p, "serialize") == 0 )
+        {
+            opt.serialize = atoi( q );
+            if( opt.serialize < 0 || opt.serialize > 1)
+                goto usage;
+        }
         else if( strcmp( p, "eap_tls" ) == 0 )
         {
             opt.eap_tls = atoi( q );
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 3279cda..7c431a0 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -171,6 +171,8 @@
 #define DFL_DGRAM_PACKING        1
 #define DFL_EXTENDED_MS         -1
 #define DFL_ETM                 -1
+#define DFL_SERIALIZE           0
+#define DFL_EXTENDED_MS_ENFORCE -1
 #define DFL_CA_CALLBACK         0
 #define DFL_EAP_TLS             0
 #define DFL_REPRODUCIBLE        0
@@ -499,6 +501,7 @@
     "                                configuration macro is defined and 1\n"  \
     "                                otherwise. The expansion of the macro\n" \
     "                                is printed if it is defined\n"     \
+    "    serialize=%%d        default: 0 (do not serialize/deserialize)\n" \
     " acceptable ciphersuite names:\n"
 
 #define ALPN_LIST_SIZE  10
@@ -590,6 +593,7 @@
     int cid_enabled_renego;     /* whether to use the CID extension or not
                                  * during renegotiation                     */
     const char *cid_val;        /* the CID to use for incoming messages     */
+    int serialize;              /* serialize/deserialize connection         */
     const char *cid_val_renego; /* the CID to use for incoming messages
                                  * after renegotiation                      */
     int reproducible;           /* make communication reproducible          */
@@ -1872,6 +1876,7 @@
     opt.badmac_limit        = DFL_BADMAC_LIMIT;
     opt.extended_ms         = DFL_EXTENDED_MS;
     opt.etm                 = DFL_ETM;
+    opt.serialize           = DFL_SERIALIZE;
     opt.eap_tls             = DFL_EAP_TLS;
     opt.reproducible        = DFL_REPRODUCIBLE;
 
@@ -2286,6 +2291,12 @@
         {
             return query_config( q );
         }
+        else if( strcmp( p, "serialize") == 0 )
+        {
+            opt.serialize = atoi( q );
+            if( opt.serialize < 0 || opt.serialize > 1)
+                goto usage;
+        }
         else if( strcmp( p, "eap_tls" ) == 0 )
         {
             opt.eap_tls = atoi( q );