diff --git a/plugins/geenforce/api/routes.py b/plugins/geenforce/api/routes.py
index 86b8fb2..aa12163 100644
--- a/plugins/geenforce/api/routes.py
+++ b/plugins/geenforce/api/routes.py
@@ -1116,9 +1116,20 @@ def list_reports():
             latest_cache[key] = _current_published_version(*key)
         latest = latest_cache[key]
         known = facts.get((report.hostname or '').lower(), {})
-        isstale = (stalecutoff is not None
-                   and (report.receivedat is None
-                        or report.receivedat < stalecutoff))
+        # Two separate ways to have gone quiet, and the table has a column for
+        # each. receivedat is the SERVER's record of the last report it got;
+        # lastcheckin is the client's own claim about when it last ran. A PC can
+        # fail either way round - silent to the server, or still posting while
+        # its own cycle has stopped advancing - so both count.
+        #
+        # They are checked independently rather than by taking the newer of the
+        # two: lastcheckin is client-asserted, so a wrong or future value there
+        # must not be able to mask real silence on receivedat.
+        isstale = stalecutoff is not None and (
+            report.receivedat is None
+            or report.receivedat < stalecutoff
+            or (report.lastcheckin is not None
+                and report.lastcheckin < stalecutoff))
         data.append({
             'reportid': report.reportid,
             'hostname': report.hostname,
diff --git a/plugins/geenforce/frontend/views/EnforcementReports.vue b/plugins/geenforce/frontend/views/EnforcementReports.vue
index 9b4cc46..0f1eeb7 100644
--- a/plugins/geenforce/frontend/views/EnforcementReports.vue
+++ b/plugins/geenforce/frontend/views/EnforcementReports.vue
@@ -192,9 +192,11 @@ function statusClass(status) {
 }
 
 function staleTitle(report) {
-  const last = report.receivedat ? formatDate(report.receivedat) : 'never'
-  return `No report for over ${report.staleafterminutes} minutes.`
-    + ` Last heard ${last}, reporting "${report.status}".`
+  const received = report.receivedat ? formatDate(report.receivedat) : 'never'
+  const checkin = report.lastcheckin ? formatDate(report.lastcheckin) : 'not reported'
+  return `Nothing heard for over ${report.staleafterminutes} minutes.`
+    + ` Last report received ${received}, PC last checked in ${checkin},`
+    + ` reporting "${report.status}".`
 }
 function actionClass(action) {
   return { installed: 'badge-info', skipped: 'badge-success', failed: 'badge-danger',
diff --git a/tests/test_plugins/test_geenforce_reporting.py b/tests/test_plugins/test_geenforce_reporting.py
index db0da61..daedef3 100644
--- a/tests/test_plugins/test_geenforce_reporting.py
+++ b/tests/test_plugins/test_geenforce_reporting.py
@@ -285,3 +285,54 @@ def test_zero_disables_the_stale_check(client, db, app, auth_headers):
                      headers=auth_headers).get_json()['data'][0]
     assert row['isstale'] is False
     assert row['staleafterminutes'] == 0
+
+
+def test_a_pc_still_posting_with_a_stalled_checkin_is_stale(client, db, app,
+                                                            auth_headers):
+    """The other way round: the server hears from it, but its own cycle stopped.
+
+    receivedat stays current while the PC's self-reported lastcheckin does not
+    advance. The fleet table has a column for each, and either going quiet is a
+    problem worth seeing.
+    """
+    from datetime import timedelta
+    from plugins.geenforce.service import _utcnow
+    _seed_and_publish(app)
+    secret = _token(client, auth_headers, ['geenforce.report'])
+    client.post('/api/geenforce/report', json={
+        'hostname': 'WJCMM01', 'scopename': 'gea-shopfloor-cmm',
+        'appliedversion': 1, 'enforcerversion': '2.6',
+        'lastcheckin': (_utcnow() - timedelta(hours=22)).isoformat() + 'Z',
+        'counts': {'installed': 1, 'skipped': 0, 'failed': 0, 'filtered': 0},
+        'results': [{'name': 'Alpha', 'action': 'installed'}],
+    }, headers={'X-API-Key': secret})
+
+    row = client.get('/api/geenforce/reports',
+                     headers=auth_headers).get_json()['data'][0]
+    assert row['status'] == 'ok', 'the cycle itself reported clean'
+    assert row['isstale'] is True, 'but it has not checked in for 22 hours'
+
+
+def test_a_future_checkin_cannot_mask_server_side_silence(client, db, app,
+                                                          auth_headers):
+    """lastcheckin is client-asserted, so it must not be able to vouch for a PC.
+
+    Taking the newer of the two timestamps would let a PC with a wrong clock
+    report itself healthy forever. receivedat is checked on its own.
+    """
+    from datetime import timedelta
+    from plugins.geenforce.service import _utcnow
+    _seed_and_publish(app)
+    secret = _token(client, auth_headers, ['geenforce.report'])
+    client.post('/api/geenforce/report', json={
+        'hostname': 'WJCMM01', 'scopename': 'gea-shopfloor-cmm',
+        'appliedversion': 1, 'enforcerversion': '2.6',
+        'lastcheckin': (_utcnow() + timedelta(days=3)).isoformat() + 'Z',
+        'counts': {'installed': 1, 'skipped': 0, 'failed': 0, 'filtered': 0},
+        'results': [{'name': 'Alpha', 'action': 'installed'}],
+    }, headers={'X-API-Key': secret})
+    _age_report(db, 'WJCMM01', minutes=60 * 26)
+
+    row = client.get('/api/geenforce/reports',
+                     headers=auth_headers).get_json()['data'][0]
+    assert row['isstale'] is True