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diff --git a/packages/taler-harness/src/integrationtests/test-libeufin-bad-gateway.ts b/packages/taler-harness/src/integrationtests/test-libeufin-bad-gateway.ts
new file mode 100644
index 000000000..53aacca84
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+++ b/packages/taler-harness/src/integrationtests/test-libeufin-bad-gateway.ts
@@ -0,0 +1,74 @@
+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Imports.
+ */
+import { GlobalTestState, delayMs } from "../harness/harness.js";
+import {
+  NexusUserBundle,
+  LibeufinNexusApi,
+  LibeufinNexusService,
+  LibeufinSandboxService,
+} from "../harness/libeufin.js";
+
+/**
+ * Testing how Nexus reacts when the Sandbox is unreachable.
+ * Typically, because the user specified a wrong EBICS endpoint.
+ */
+export async function runLibeufinBadGatewayTest(t: GlobalTestState) {
+  /**
+   * User saltetd "01"
+   */
+  const user01nexus = new NexusUserBundle(
+    "01", "http://localhost:5010/not-found", // the EBICS endpoint at Sandbox
+  );
+
+  // Start Nexus
+  const libeufinNexus = await LibeufinNexusService.create(t, {
+    httpPort: 5011,
+    databaseJdbcUri: `jdbc:sqlite:${t.testDir}/libeufin-nexus.sqlite3`,
+  });
+  await libeufinNexus.start();
+  await libeufinNexus.pingUntilAvailable();
+
+  // Start Sandbox
+  const libeufinSandbox = await LibeufinSandboxService.create(t, {
+    httpPort: 5010,
+    databaseJdbcUri: `jdbc:sqlite:${t.testDir}/libeufin-sandbox.sqlite3`,
+  });
+  await libeufinSandbox.start();
+  await libeufinSandbox.pingUntilAvailable();
+  
+  // Connecting to a non-existent Sandbox endpoint.
+  await LibeufinNexusApi.createEbicsBankConnection(
+    libeufinNexus,
+    user01nexus.connReq
+  );
+
+  // 502 Bad Gateway expected.
+  try {
+    await LibeufinNexusApi.connectBankConnection(
+      libeufinNexus,
+      user01nexus.connReq.name,
+    );
+  } catch(e: any) {
+    t.assertTrue(e.response.status == 502);
+    return;
+  }
+  t.assertTrue(false);
+}
+runLibeufinBadGatewayTest.suites = ["libeufin"];