diff --git a/src/open_inwoner/accounts/signals.py b/src/open_inwoner/accounts/signals.py
index a7fce05d56..f1d869fb1e 100644
--- a/src/open_inwoner/accounts/signals.py
+++ b/src/open_inwoner/accounts/signals.py
@@ -8,6 +8,7 @@
 
 from open_inwoner.haalcentraal.models import HaalCentraalConfig
 from open_inwoner.haalcentraal.utils import update_brp_data_in_db
+from open_inwoner.openklant.exceptions import KlantenServiceError
 from open_inwoner.openklant.models import OpenKlant2Config
 from open_inwoner.openklant.services import OpenKlant2Service, eSuiteKlantenService
 from open_inwoner.utils.logentry import user_action
@@ -42,7 +43,7 @@ def update_user_from_klant_on_login(sender, user, request, *args, **kwargs):
     if use_ok2 and (openklant2_config := OpenKlant2Config.from_django_settings()):
         try:
             service = OpenKlant2Service(config=openklant2_config)
-        except RuntimeError:
+        except KlantenServiceError:
             logger.error("OpenKlant2 service failed to build")
             return
 
@@ -58,7 +59,7 @@ def update_user_from_klant_on_login(sender, user, request, *args, **kwargs):
     # eSuite
     try:
         service = eSuiteKlantenService()
-    except RuntimeError:
+    except KlantenServiceError:
         logger.error("eSuiteKlantenService failed to build")
         return
 
diff --git a/src/open_inwoner/accounts/views/contactmoments.py b/src/open_inwoner/accounts/views/contactmoments.py
index 819a7ea85c..bc12e3ac9a 100644
--- a/src/open_inwoner/accounts/views/contactmoments.py
+++ b/src/open_inwoner/accounts/views/contactmoments.py
@@ -2,6 +2,7 @@
 from datetime import datetime
 from typing import TypedDict
 
+from django.contrib import messages
 from django.contrib.auth.mixins import AccessMixin
 from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import redirect
@@ -12,6 +13,7 @@
 from django.views.generic import TemplateView
 
 from glom import glom
+from requests.exceptions import RequestException
 from view_breadcrumbs import BaseBreadcrumbMixin
 
 from open_inwoner.openklant.api_models import KlantContactMoment
@@ -35,6 +37,7 @@
 )
 from open_inwoner.openzaak.clients import MultiZgwClientProxy
 from open_inwoner.openzaak.models import ZGWApiGroupConfig
+from open_inwoner.utils.api import ClientError
 from open_inwoner.utils.mixins import PaginationMixin
 from open_inwoner.utils.views import CommonPageMixin
 
@@ -175,9 +178,20 @@ def get_anchors(self) -> list:
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
 
-        kcms = fetch_klantcontactmomenten(
-            **get_fetch_parameters(self.request, use_vestigingsnummer=True)
-        )
+        try:
+            kcms = fetch_klantcontactmomenten(
+                **get_fetch_parameters(self.request, use_vestigingsnummer=True)
+            )
+        # TODO: replace with custom exception when openklant refactor is done
+        except (RequestException, ClientError):
+            kcms = []
+            messages.add_message(
+                self.request,
+                messages.ERROR,
+                _(
+                    "Het was niet mogelijk om uw vragen op te halen, probeer het later nog eens"
+                ),
+            )
 
         klant_config = OpenKlantConfig.get_solo()
         if exclude_range := klant_config.exclude_contactmoment_kanalen:
diff --git a/src/open_inwoner/accounts/views/mixins.py b/src/open_inwoner/accounts/views/mixins.py
index 7d26dac4a3..56095c83b0 100644
--- a/src/open_inwoner/accounts/views/mixins.py
+++ b/src/open_inwoner/accounts/views/mixins.py
@@ -1,5 +1,6 @@
 import logging
 
+from open_inwoner.openklant.exceptions import KlantenServiceError
 from open_inwoner.openklant.models import OpenKlantConfig
 from open_inwoner.openklant.services import eSuiteKlantenService
 
@@ -13,7 +14,7 @@ def patch_klant(self, update_data: dict):
 
         try:
             service = eSuiteKlantenService(config=OpenKlantConfig.get_solo())
-        except RuntimeError:
+        except KlantenServiceError:
             logger.error("Error building KlantenService")
             return
 
diff --git a/src/open_inwoner/accounts/views/signals.py b/src/open_inwoner/accounts/views/signals.py
index 04177e0f05..98e103b438 100644
--- a/src/open_inwoner/accounts/views/signals.py
+++ b/src/open_inwoner/accounts/views/signals.py
@@ -5,6 +5,7 @@
 from django.dispatch import receiver
 
 from open_inwoner.accounts.models import User
+from open_inwoner.openklant.exceptions import KlantenServiceError
 from open_inwoner.openklant.models import OpenKlant2Config
 from open_inwoner.openklant.services import OpenKlant2Service, eSuiteKlantenService
 
@@ -28,7 +29,7 @@ def get_or_create_klant_for_new_user(
     if use_ok2 and (openklant2_config := OpenKlant2Config.from_django_settings()):
         try:
             service = OpenKlant2Service(config=openklant2_config)
-        except RuntimeError:
+        except KlantenServiceError:
             logger.error("OpenKlant2 service failed to build")
             return
 
@@ -53,7 +54,7 @@ def get_or_create_klant_for_new_user(
     # eSuite
     try:
         service = eSuiteKlantenService()
-    except RuntimeError:
+    except KlantenServiceError:
         logger.error("eSuiteKlantenService failed to build")
         return
 
diff --git a/src/open_inwoner/cms/cases/views/cases.py b/src/open_inwoner/cms/cases/views/cases.py
index d7f806bdab..3b46097991 100644
--- a/src/open_inwoner/cms/cases/views/cases.py
+++ b/src/open_inwoner/cms/cases/views/cases.py
@@ -1,6 +1,7 @@
 import logging
 from typing import Sequence
 
+from django.contrib import messages
 from django.urls import reverse
 from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
@@ -15,6 +16,7 @@
 from open_inwoner.utils.mixins import PaginationMixin
 from open_inwoner.utils.views import CommonPageMixin
 
+from .exceptions import ZakenServiceError
 from .mixins import CaseAccessMixin, CaseLogMixin, OuterCaseAccessMixin
 from .services import CaseFilterFormOption, CaseListService
 
@@ -70,8 +72,19 @@ def get_context_data(self, **kwargs):
         context["filter_form_enabled"] = config.zaken_filter_enabled
 
         # update ctx with open submissions and cases (possibly fitered)
-        open_submissions: Sequence[UniformCase] = case_service.get_submissions()
-        preprocessed_cases: Sequence[UniformCase] = case_service.get_cases()
+        open_submissions = []
+        preprocessed_cases = []
+        try:
+            open_submissions: Sequence[UniformCase] = case_service.get_submissions()
+            preprocessed_cases: Sequence[UniformCase] = case_service.get_cases()
+        except ZakenServiceError:
+            messages.add_message(
+                self.request,
+                messages.ERROR,
+                _(
+                    "Het was niet mogelijk om uw anvragen op te halen, probeer het later nog eens"
+                ),
+            )
 
         if config.zaken_filter_enabled:
             case_status_frequencies = case_service.get_case_status_frequencies()
diff --git a/src/open_inwoner/cms/cases/views/exceptions.py b/src/open_inwoner/cms/cases/views/exceptions.py
new file mode 100644
index 0000000000..2e35032908
--- /dev/null
+++ b/src/open_inwoner/cms/cases/views/exceptions.py
@@ -0,0 +1,2 @@
+class ZakenServiceError(Exception):
+    pass
diff --git a/src/open_inwoner/cms/cases/views/services.py b/src/open_inwoner/cms/cases/views/services.py
index d9ae67e08c..7e1b222bfa 100644
--- a/src/open_inwoner/cms/cases/views/services.py
+++ b/src/open_inwoner/cms/cases/views/services.py
@@ -19,6 +19,8 @@
 )
 from open_inwoner.openzaak.utils import get_user_fetch_parameters, is_zaak_visible
 
+from .exceptions import ZakenServiceError
+
 logger = logging.getLogger(__name__)
 
 
@@ -131,6 +133,7 @@ def get_submissions(self) -> list[SubmissionWithApiGroup]:
                         )
                 except BaseException:
                     logger.exception("Error fetching and pre-processing cases")
+                    raise ZakenServiceError
 
         # Sort submissions by date modified
         subs_with_api_group.sort(
@@ -184,6 +187,7 @@ def get_cases(self) -> list[ZaakWithApiGroup]:
                         "Error while fetching and pre-processing cases for API group %s",
                         group_for_task,
                     )
+                    raise
 
         # Ensure stable sorting for pagination and testing purposes
         cases_with_api_group.sort(key=lambda c: all_api_groups.index(c.api_group))
diff --git a/src/open_inwoner/cms/cases/views/status.py b/src/open_inwoner/cms/cases/views/status.py
index 9efa197b90..0cc322f27a 100644
--- a/src/open_inwoner/cms/cases/views/status.py
+++ b/src/open_inwoner/cms/cases/views/status.py
@@ -26,6 +26,7 @@
 from zgw_consumers.api_models.constants import RolOmschrijving
 
 from open_inwoner.mail.service import send_contact_confirmation_mail
+from open_inwoner.openklant.exceptions import KlantenServiceError
 from open_inwoner.openklant.models import OpenKlantConfig
 from open_inwoner.openklant.services import eSuiteKlantenService, eSuiteVragenService
 from open_inwoner.openklant.wrap import (
@@ -165,14 +166,22 @@ def get_context_data(self, **kwargs):
             # questions/E-suite contactmomenten
             try:
                 service = eSuiteVragenService(config=openklant_config)
-            except RuntimeError:
-                logger.error("Failed to build eSuiteVragenService")
-                objectcontactmomenten = []
-            else:
                 objectcontactmomenten = service.retrieve_objectcontactmomenten_for_zaak(
                     self.case
                 )
-
+            except KlantenServiceError:
+                logger.error(
+                    "There was a problem fetching objectcontactmomenten with eSuiteVragenService for %s"
+                    % self.case
+                )
+                objectcontactmomenten = []
+                messages.add_message(
+                    self.request,
+                    messages.ERROR,
+                    _(
+                        "Het was niet mogelijk om uw vragen op te halen, probeer het later nog eens"
+                    ),
+                )
             questions = []
             for ocm in objectcontactmomenten:
                 question = getattr(ocm, "contactmoment", None)
diff --git a/src/open_inwoner/openklant/clients.py b/src/open_inwoner/openklant/clients.py
index 96b6459ada..24d4e2a7de 100644
--- a/src/open_inwoner/openklant/clients.py
+++ b/src/open_inwoner/openklant/clients.py
@@ -114,7 +114,7 @@ def retrieve_klanten_for_bsn(self, user_bsn: str) -> list[Klant]:
             all_data = list(pagination_helper(self, data))
         except (RequestException, ClientError) as e:
             logger.exception("exception while making request", exc_info=e)
-            return []
+            raise
 
         klanten = factory(Klant, all_data)
 
@@ -139,7 +139,7 @@ def retrieve_klanten_for_kvk_or_rsin(
             all_data = list(pagination_helper(self, data))
         except (RequestException, ClientError) as e:
             logger.exception("exception while making request", exc_info=e)
-            return []
+            raise
 
         klanten = factory(Klant, all_data)
 
@@ -243,7 +243,7 @@ def retrieve_objectcontactmomenten_for_zaak(
             all_data = list(pagination_helper(self, data))
         except (RequestException, ClientError) as exc:
             logger.exception("exception while making request", exc_info=exc)
-            return []
+            raise
 
         object_contact_momenten = factory(ObjectContactMoment, all_data)
 
diff --git a/src/open_inwoner/openklant/exceptions.py b/src/open_inwoner/openklant/exceptions.py
new file mode 100644
index 0000000000..d2dea0500f
--- /dev/null
+++ b/src/open_inwoner/openklant/exceptions.py
@@ -0,0 +1,2 @@
+class KlantenServiceError(Exception):
+    pass
diff --git a/src/open_inwoner/openklant/services.py b/src/open_inwoner/openklant/services.py
index 0c08753c40..8f4c979dc0 100644
--- a/src/open_inwoner/openklant/services.py
+++ b/src/open_inwoner/openklant/services.py
@@ -27,6 +27,7 @@
     KlantCreateData,
     ObjectContactMoment,
 )
+from open_inwoner.openklant.exceptions import KlantenServiceError
 from open_inwoner.openklant.models import OpenKlant2Config, OpenKlantConfig
 from open_inwoner.openzaak.api_models import Zaak
 from open_inwoner.utils.api import ClientError, get_json_response
@@ -97,17 +98,19 @@ class eSuiteKlantenService(KlantenService):
     def __init__(self, config: OpenKlantConfig | None = None):
         self.config = config or OpenKlantConfig.get_solo()
         if not self.config:
-            raise RuntimeError("eSuiteKlantenService instance needs a configuration")
+            raise KlantenServiceError(
+                "eSuiteKlantenService instance needs a configuration"
+            )
 
         self.service_config = self.config.klanten_service
         if not self.service_config:
-            raise RuntimeError(
+            raise KlantenServiceError(
                 "eSuiteKlantenService instance needs a servivce configuration"
             )
 
         self.client = build_zgw_client(service=self.service_config)
         if not self.client:
-            raise RuntimeError("eSuiteKlantenService instance needs a client")
+            raise KlantenServiceError("eSuiteKlantenService instance needs a client")
 
     def get_or_create_klant(
         self, fetch_params: FetchParameters, user: User
@@ -312,17 +315,19 @@ class eSuiteVragenService(KlantenService):
     def __init__(self, config: OpenKlantConfig | None = None):
         self.config = config or OpenKlantConfig.get_solo()
         if not self.config:
-            raise RuntimeError("eSuiteVragenService instance needs a configuration")
+            raise KlantenServiceError(
+                "eSuiteVragenService instance needs a configuration"
+            )
 
         self.service_config = self.config.contactmomenten_service
         if not self.service_config:
-            raise RuntimeError(
+            raise KlantenServiceError(
                 "eSuiteVragenService instance needs a servivce configuration"
             )
 
         self.client = build_zgw_client(service=self.service_config)
         if not self.client:
-            raise RuntimeError("eSuiteVragenService instance needs a client")
+            raise KlantenServiceError("eSuiteVragenService instance needs a client")
 
     #
     # contactmomenten
@@ -430,7 +435,7 @@ def retrieve_objectcontactmomenten_for_zaak(
             all_data = list(pagination_helper(self, data))
         except (RequestException, ClientError) as exc:
             logger.exception("exception while making request", exc_info=exc)
-            return []
+            raise KlantenServiceError
 
         object_contact_momenten = factory(ObjectContactMoment, all_data)
 
@@ -550,7 +555,9 @@ class OpenKlant2Service(KlantenService):
     def __init__(self, config: OpenKlant2Config | None = None):
         self.config = config or OpenKlant2Config.from_django_settings()
         if not self.config:
-            raise RuntimeError("OpenKlant2Service instance needs a configuration")
+            raise KlantenServiceError(
+                "OpenKlant2Service instance needs a configuration"
+            )
 
         self.client = OpenKlant2Client(
             base_url=self.config.api_url,
@@ -559,7 +566,7 @@ def __init__(self, config: OpenKlant2Config | None = None):
             },
         )
         if not self.client:
-            raise RuntimeError("OpenKlant2Service instance needs a client")
+            raise KlantenServiceError("OpenKlant2Service instance needs a client")
 
         if mijn_vragen_actor := getattr(config, "mijn_vragen_actor", None):
             self.mijn_vragen_actor = (
diff --git a/src/open_inwoner/openzaak/clients.py b/src/open_inwoner/openzaak/clients.py
index 34cf75626f..7d34397b60 100644
--- a/src/open_inwoner/openzaak/clients.py
+++ b/src/open_inwoner/openzaak/clients.py
@@ -130,7 +130,7 @@ def fetch_cases_by_bsn(
                     headers=CRS_HEADERS,
                 )
             )
-        except (RequestException, ClientError) as e:
+        except (RequestException, ClientError, Exception) as e:
             logger.exception("exception while making request", exc_info=e)
             return []
 
diff --git a/src/open_inwoner/templates/pages/cases/list_inner.html b/src/open_inwoner/templates/pages/cases/list_inner.html
index 80f2fb4c93..67b5aea6b4 100644
--- a/src/open_inwoner/templates/pages/cases/list_inner.html
+++ b/src/open_inwoner/templates/pages/cases/list_inner.html
@@ -1,4 +1,10 @@
-{% load link_tags button_tags i18n grid_tags icon_tags list_tags pagination_tags utils %}
+{% load link_tags button_tags i18n grid_tags icon_tags list_tags notification_tags pagination_tags utils %}
+
+{% block notifications %}
+    <div class="container container--no-margin">
+        {% notifications messages closable=True %}
+    </div>
+{% endblock %}
 
 <h1 class="utrecht-heading-1" id="cases">{{ page_title }} ({{ paginator.count }})</h1>
 <p class="utrecht-paragraph utrecht-paragraph--oip utrecht-paragraph--oip-title-text">{{ title_text }}</p>