diff --git a/src/capture.ts b/src/capture.ts
index dcc669e..6a2ccc8 100644
--- a/src/capture.ts
+++ b/src/capture.ts
@@ -26,6 +26,9 @@ function publicErrorFor(error: unknown): string {
   if (/captcha|verify|robot/i.test(message)) {
     return "ChatGPT asked for verification, so this public share could not be captured automatically.";
   }
+  if (/unavailable|no longer public|not public|redirected away/i.test(message)) {
+    return "This ChatGPT share is not available publicly anymore, so it cannot be captured.";
+  }
   if (/timeout/i.test(message)) {
     return "The public ChatGPT share took too long to load.";
   }
@@ -271,9 +274,11 @@ async function extractConversation(sourceUrl: string): Promise<ExtractedConversa
     if (!page) throw new Error("Chromium CDP page target was not created.");
     await page.setViewportSize({ width: 1360, height: 900 }).catch(() => undefined);
   page.setDefaultTimeout(config.captureTimeoutMs);
+  const expectedPath = new URL(sourceUrl).pathname;
   await page
     .waitForFunction(
-      () => {
+      (sharePath) => {
+        if (!location.pathname.startsWith(sharePath)) return true;
         const bodyText = document.body?.innerText || document.body?.textContent || "";
         if (/verify you are human|captcha|unusual activity/i.test(bodyText)) return true;
         if (document.querySelectorAll("[data-message-author-role]").length > 0) return true;
@@ -281,12 +286,18 @@ async function extractConversation(sourceUrl: string): Promise<ExtractedConversa
         if ((markdown?.textContent || "").trim().length > 0) return true;
         return /(?:^|\s)(You said:|ChatGPT said:)/.test(bodyText);
       },
+      expectedPath,
       { timeout: config.captureTimeoutMs }
     )
     .catch(() => undefined);
   await page.waitForLoadState("networkidle", { timeout: 5_000 }).catch(() => undefined);
   await page.waitForTimeout(1000);
 
+  const actualUrl = page.url();
+  if (!new URL(actualUrl).pathname.startsWith(expectedPath)) {
+    throw new Error(`ChatGPT share is unavailable or no longer public: page redirected away to ${actualUrl}.`);
+  }
+
   const extracted = await withTimeout(page.evaluate(() => {
     function cleanHtml(root: Element): string {
       const clone = root.cloneNode(true) as Element;
diff --git a/src/db.ts b/src/db.ts
index d4185b3..ad44398 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -90,6 +90,17 @@ export class Store {
       .run(status, detail?.errorPublic ?? null, detail?.errorDetail ?? null, new Date().toISOString(), id);
   }
 
+  retryCapture(id: string): void {
+    this.db
+      .prepare(
+        `UPDATE captures
+         SET status = 'queued', title = NULL, error_public = NULL, error_detail = NULL,
+             data_json = NULL, metadata_json = NULL, captured_at = NULL, updated_at = ?
+         WHERE id = ?`
+      )
+      .run(new Date().toISOString(), id);
+  }
+
   completeCapture(id: string, input: { slug: string; title: string; dataJson: string; metadataJson: string }): void {
     const now = new Date().toISOString();
     this.db
diff --git a/src/server.ts b/src/server.ts
index b6ceba5..4919185 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -130,7 +130,7 @@ app.post(route("/api/captures/:id/retry"), requireAdmin, (req, res) => {
     res.status(409).json({ error: "Successful captures are immutable. Create a new capture instead." });
     return;
   }
-  store.updateStatus(row.id, "queued");
+  store.retryCapture(row.id);
   captureQueue.enqueue(row.id);
   res.json({ capture: publicCapture(store.getCapture(row.id)) });
 });