ConnectionTask: Fix request failure retrying

source/agora/network/NetworkManager.d

@@ -162,11 +162,14 @@ public class NetworkManager
                     key = client.getPublicKey();
                     break;
                 }
-                catch (HTTPStatusException ex)
+                catch (Exception ex)
                 {
-                    // 404 => API not implemented, it's a FullNode
-                    if (ex.status == 404)
-                        break;
+                    if (auto http = cast(HTTPStatusException)ex)
+                    {
+                        // 404 => API not implemented, it's a FullNode
+                        if (http.status == 404)
+                            break;
+                    }
 
                     if (!this.onFailedRequest(this.address))
                         return;

source/agora/test/Timeout.d

@@ -0,0 +1,37 @@
+/*******************************************************************************
+
+    Tests connection timeouts
+
+    Copyright:
+        Copyright (c) 2020 BOS Platform Foundation Korea
+        All rights reserved.
+
+    License:
+        MIT License. See LICENSE for details.
+
+*******************************************************************************/
+
+module agora.test.Timeout;
+
+version (unittest):
+
+import agora.api.Validator;
+import agora.consensus.data.Transaction;
+import agora.test.Base;
+
+///
+unittest
+{
+    TestConf conf = { retry_delay : 1.msecs,
+        max_retries : 2,
+        timeout : 500.msecs,
+        max_failed_requests : 1000 };  // never ban
+    auto network = makeTestNetwork(conf);
+    auto nodes = network.clients;
+
+    nodes[$-1].ctrl.sleep(2.seconds, false);
+    network.start();
+    scope(exit) network.shutdown();
+    scope(failure) network.printLogs();
+    network.waitForDiscovery();
+}