- Michael Smith posted bug report #2786255

(http://curl.haxx.se/bug/view.cgi?id=2786255) with a patch, identifying how
  libcurl did not deal with SSL session ids properly if the server rejected a
  re-use of one. Starting now, it will forget the rejected one and remember
  the new. This change was for OpenSSL only, it is likely that other SSL lib
  code needs similar fixes.

lib/sslgen.c

@@ -271,6 +271,22 @@ static int kill_session(struct curl_ssl_session *session)
     return 1;
 }
 
+/*
+ * Delete the given session ID from the cache.
+ */
+void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid)
+{
+  int i;
+  for(i=0; i< conn->data->set.ssl.numsessions; i++) {
+    struct curl_ssl_session *check = &conn->data->state.session[i];
+
+    if (check->sessionid == ssl_sessionid) {
+      kill_session(check);
+      break;
+    }
+  }
+}
+
 /*
  * Store session id in the session cache. The ID passed on to this function
  * must already have been extracted and allocated the proper way for the SSL