diff --git a/packages/graph-explorer-proxy-server/src/app.test.ts b/packages/graph-explorer-proxy-server/src/app.test.ts
index 411f25f27..9d44cdd95 100644
--- a/packages/graph-explorer-proxy-server/src/app.test.ts
+++ b/packages/graph-explorer-proxy-server/src/app.test.ts
@@ -498,6 +498,13 @@ describe("createApp", () => {
         .send({ gremlin: "test" });
 
       expect(response.status).toBe(400);
+      expect(response.body.error.message).toContain(
+        "Must not include a username or password",
+      );
+      expect(mockFetch).not.toHaveBeenCalledWith(
+        expect.stringContaining("my-graph-db.example.com"),
+        expect.anything(),
+      );
     });
 
     it("does not echo the rejected value back to the client", async () => {
diff --git a/packages/graph-explorer/src/connections/defaultConnection.test.ts b/packages/graph-explorer/src/connections/defaultConnection.test.ts
index 0908d6a34..411cc7450 100644
--- a/packages/graph-explorer/src/connections/defaultConnection.test.ts
+++ b/packages/graph-explorer/src/connections/defaultConnection.test.ts
@@ -257,6 +257,20 @@ describe("backward compatibility: main-era defaultConnection.json", () => {
     });
   });
 
+  test("keeps the full path of a direct public endpoint", () => {
+    const connection = readFile({
+      GRAPH_EXP_PUBLIC_OR_PROXY_ENDPOINT:
+        "http://blazegraph:9999/blazegraph/namespace/kb",
+      GRAPH_EXP_USING_PROXY_SERVER: false,
+      GRAPH_EXP_GRAPH_TYPE: "sparql",
+    });
+
+    expect(connection?.graphDbUrl).toBe(
+      "http://blazegraph:9999/blazegraph/namespace/kb",
+    );
+    expect(connection?.proxyConnection).toBe(false);
+  });
+
   // Earlier versions defaulted a missing flag to false for this file
   test("connects directly to the public endpoint when the flag is absent and both URLs are set", () => {
     const connection = readFile(createMainEraFile());
diff --git a/packages/graph-explorer/src/core/StateProvider/activeConnectionStorage.test.ts b/packages/graph-explorer/src/core/StateProvider/activeConnectionStorage.test.ts
index e26689ebc..e696e2eda 100644
--- a/packages/graph-explorer/src/core/StateProvider/activeConnectionStorage.test.ts
+++ b/packages/graph-explorer/src/core/StateProvider/activeConnectionStorage.test.ts
@@ -26,6 +26,11 @@ async function openTab() {
   let atom = await createActiveConnectionIdAtom({ sessionStorage });
   return {
     read: () => store.get(atom),
+    /**
+     * Mounts the atom the way a rendered component does, so a cross-tab sync
+     * wired through `onMount` would reach this tab.
+     */
+    subscribe: () => store.sub(atom, () => {}),
     /** Activates a connection; resolves once the breadcrumb has landed. */
     activate: (id: ReturnType<typeof createConnectionId> | null) => {
       store.set(atom, id);
@@ -144,6 +149,7 @@ describe("activeConnectionStorage across tabs", () => {
 
   test("activating a connection in one tab does not change an already-open tab", async () => {
     const tabB = await openTab();
+    tabB.subscribe();
     const tabBConnection = createConnectionId();
     await tabB.activate(tabBConnection);
 
diff --git a/packages/graph-explorer/src/core/StateProvider/sessionScopedStorage.test.ts b/packages/graph-explorer/src/core/StateProvider/sessionScopedStorage.test.ts
index 36ae0bf31..96eae2ce8 100644
--- a/packages/graph-explorer/src/core/StateProvider/sessionScopedStorage.test.ts
+++ b/packages/graph-explorer/src/core/StateProvider/sessionScopedStorage.test.ts
@@ -58,6 +58,11 @@ function tabOpener<T>(
     let atom = await createSessionScopedAtom<T>({ ...options, sessionStorage });
     return {
       read: () => store.get(atom),
+      /**
+       * Mounts the atom the way a rendered component does, so a cross-tab sync
+       * wired through `onMount` would reach this tab.
+       */
+      subscribe: () => store.sub(atom, () => {}),
       write: (value: T) => {
         store.set(atom, value);
         return persistenceStatusStore.waitForIdle();
@@ -319,6 +324,7 @@ describe("createSessionScopedAtom", () => {
 describe("createSessionScopedAtom across tabs", () => {
   test("writing in one tab does not change an already-open tab", async () => {
     const tabB = await openTab();
+    tabB.subscribe();
     await tabB.write({ count: 2 });
 
     const tabA = await openTab();
@@ -471,6 +477,7 @@ describe("backward compatibility: graph view layout breadcrumb", () => {
 describe("graph view layout across tabs", () => {
   test("changing the view layout in one tab does not change an already-open tab", async () => {
     const tabB = await openGraphViewTab();
+    tabB.subscribe();
     const tabBLayout: GraphViewLayout = {
       ...defaultGraphViewLayout,
       activeSidebarItem: "filters",
@@ -517,6 +524,7 @@ describe("schema view layout across tabs", () => {
 
   test("changing the view layout in one tab does not change an already-open tab", async () => {
     const tabB = await openSchemaViewTab();
+    tabB.subscribe();
     const tabBLayout: SchemaViewLayout = {
       ...defaultSchemaViewLayout,
       activeSidebarItem: "styles",
diff --git a/packages/graph-explorer/src/core/connectionLink/validation.test.ts b/packages/graph-explorer/src/core/connectionLink/validation.test.ts
index 5a230f09c..b408577bd 100644
--- a/packages/graph-explorer/src/core/connectionLink/validation.test.ts
+++ b/packages/graph-explorer/src/core/connectionLink/validation.test.ts
@@ -294,6 +294,10 @@ describe("reading a connection link", () => {
   test("reports every offending parameter, not just the first", () => {
     expect(
       problemsOf("?graphDbUrl=not-a-url&queryEngine=sql&serviceType=bogus"),
-    ).toHaveLength(3);
+    ).toStrictEqual([
+      "graphDbUrl must be a valid http or https URL",
+      'queryEngine must be one of "gremlin", "openCypher", "sparql"',
+      'serviceType must be one of "neptune-db", "neptune-graph"',
+    ]);
   });
 });
diff --git a/packages/graph-explorer/src/utils/mapWithConcurrency.ts b/packages/graph-explorer/src/utils/mapWithConcurrency.ts
index 288743926..3176c84ef 100644
--- a/packages/graph-explorer/src/utils/mapWithConcurrency.ts
+++ b/packages/graph-explorer/src/utils/mapWithConcurrency.ts
@@ -10,10 +10,6 @@
  * leave the remaining lanes issuing requests nobody is waiting for. Callbacks
  * already running are not cancelled.
  *
- * That stop applies to every caller, including the openCypher and SPARQL schema
- * and edge connection fetches. They previously drained the whole queue after a
- * failure their caller had already given up on, so the change is theirs too.
- *
  * @param items The items to process
  * @param concurrency The maximum number of callbacks running at once
  * @param callback The async operation to run for each item