diff --git a/src/frontend/apps/e2e/__tests__/app-impress/doc-editor.spec.ts b/src/frontend/apps/e2e/__tests__/app-impress/doc-editor.spec.ts
index f64139b7..12da91e8 100644
--- a/src/frontend/apps/e2e/__tests__/app-impress/doc-editor.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-impress/doc-editor.spec.ts
@@ -1,14 +1,13 @@
 import path from 'path';
 
-import { expect, test } from '@playwright/test';
+import { chromium, expect, test } from '@playwright/test';
 import cs from 'convert-stream';
 
 import {
-  CONFIG,
-  addNewMember,
   createDoc,
   goToGridDoc,
   mockedDocument,
+  overrideConfig,
   verifyDocName,
 } from './common';
 
@@ -522,52 +521,141 @@ test.describe('Doc Editor', () => {
 
   test('it checks block editing when not connected to collab server', async ({
     page,
+    browserName,
   }) => {
-    await page.route('**/api/v1.0/config/', async (route) => {
-      const request = route.request();
-      if (request.method().includes('GET')) {
-        await route.fulfill({
-          json: {
-            ...CONFIG,
-            COLLABORATION_WS_URL: 'ws://localhost:5555/collaboration/ws/',
-            COLLABORATION_WS_NOT_CONNECTED_READY_ONLY: true,
-          },
-        });
-      } else {
-        await route.continue();
-      }
+    /**
+     * The good port is 4444, but we want to simulate a not connected
+     * collaborative server.
+     * So we use a port that is not used by the collaborative server.
+     * The server will not be able to connect to the collaborative server.
+     */
+    await overrideConfig(page, {
+      COLLABORATION_WS_URL: 'ws://localhost:5555/collaboration/ws/',
     });
 
     await page.goto('/');
 
-    void page
-      .getByRole('button', {
-        name: 'New doc',
-      })
-      .click();
+    const [title] = await createDoc(page, 'editing-blocking', browserName, 1);
 
     const card = page.getByLabel('It is the card information');
     await expect(
-      card.getByText('Your network do not allow you to edit'),
+      card.getByText('Others are editing. Your network prevent changes.'),
     ).toBeHidden();
     const editor = page.locator('.ProseMirror');
 
     await expect(editor).toHaveAttribute('contenteditable', 'true');
 
+    let responseCanEditPromise = page.waitForResponse(
+      (response) =>
+        response.url().includes(`/can-edit/`) && response.status() === 200,
+    );
+
     await page.getByRole('button', { name: 'Share' }).click();
 
-    await addNewMember(page, 0, 'Editor', 'impress');
+    await page.getByLabel('Visibility', { exact: true }).click();
+
+    await page
+      .getByRole('menuitem', {
+        name: 'Public',
+      })
+      .click();
+
+    await expect(
+      page.getByText('The document visibility has been updated.'),
+    ).toBeVisible();
+
+    await page.getByLabel('Visibility mode').click();
+    await page.getByRole('menuitem', { name: 'Editing' }).click();
 
     // Close the modal
     await page.getByRole('button', { name: 'close' }).first().click();
 
+    let responseCanEdit = await responseCanEditPromise;
+    expect(responseCanEdit.ok()).toBeTruthy();
+    let jsonCanEdit = (await responseCanEdit.json()) as { can_edit: boolean };
+    expect(jsonCanEdit.can_edit).toBeTruthy();
+
+    const urlDoc = page.url();
+
+    /**
+     * We open another browser that will connect to the collaborative server
+     * and will block the current browser to edit the doc.
+     */
+    const otherBrowser = await chromium.launch({ headless: true });
+    const otherContext = await otherBrowser.newContext({
+      locale: 'en-US',
+      timezoneId: 'Europe/Paris',
+      permissions: [],
+      storageState: {
+        cookies: [],
+        origins: [],
+      },
+    });
+    const otherPage = await otherContext.newPage();
+
+    const webSocketPromise = otherPage.waitForEvent(
+      'websocket',
+      (webSocket) => {
+        return webSocket
+          .url()
+          .includes('ws://localhost:4444/collaboration/ws/?room=');
+      },
+    );
+
+    await otherPage.goto(urlDoc);
+
+    const webSocket = await webSocketPromise;
+    expect(webSocket.url()).toContain(
+      'ws://localhost:4444/collaboration/ws/?room=',
+    );
+
+    await verifyDocName(otherPage, title);
+
+    await page.reload();
+
+    responseCanEditPromise = page.waitForResponse(
+      (response) =>
+        response.url().includes(`/can-edit/`) && response.status() === 200,
+    );
+
+    responseCanEdit = await responseCanEditPromise;
+    expect(responseCanEdit.ok()).toBeTruthy();
+
+    jsonCanEdit = (await responseCanEdit.json()) as { can_edit: boolean };
+    expect(jsonCanEdit.can_edit).toBeFalsy();
+
     await expect(
-      card.getByText('Your network do not allow you to edit'),
+      card.getByText('Others are editing. Your network prevent changes.'),
     ).toBeVisible({
       timeout: 10000,
     });
 
     await expect(editor).toHaveAttribute('contenteditable', 'false');
+
+    await page.getByRole('button', { name: 'Share' }).click();
+
+    await page.getByLabel('Visibility mode').click();
+    await page.getByRole('menuitem', { name: 'Reading' }).click();
+
+    // Close the modal
+    await page.getByRole('button', { name: 'close' }).first().click();
+
+    await page.reload();
+
+    responseCanEditPromise = page.waitForResponse(
+      (response) =>
+        response.url().includes(`/can-edit/`) && response.status() === 200,
+    );
+
+    responseCanEdit = await responseCanEditPromise;
+    expect(responseCanEdit.ok()).toBeTruthy();
+
+    jsonCanEdit = (await responseCanEdit.json()) as { can_edit: boolean };
+    expect(jsonCanEdit.can_edit).toBeTruthy();
+
+    await expect(
+      card.getByText('Others are editing. Your network prevent changes.'),
+    ).toBeHidden();
   });
 
   test('it checks if callout custom block', async ({ page, browserName }) => {
diff --git a/src/frontend/apps/e2e/__tests__/app-impress/doc-header.spec.ts b/src/frontend/apps/e2e/__tests__/app-impress/doc-header.spec.ts
index 0eec2455..feaf18a6 100644
--- a/src/frontend/apps/e2e/__tests__/app-impress/doc-header.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-impress/doc-header.spec.ts
@@ -15,49 +15,11 @@ test.beforeEach(async ({ page }) => {
 });
 
 test.describe('Doc Header', () => {
-  test('it checks the element are correctly displayed', async ({ page }) => {
-    await mockedDocument(page, {
-      accesses: [
-        {
-          id: 'b0df4343-c8bd-4c20-9ff6-fbf94fc94egg',
-          role: 'owner',
-          user: {
-            email: 'super@owner.com',
-            full_name: 'Super Owner',
-          },
-        },
-        {
-          id: 'b0df4343-c8bd-4c20-9ff6-fbf94fc94egg',
-          role: 'admin',
-          user: {
-            email: 'super@admin.com',
-          },
-        },
-        {
-          id: 'b0df4343-c8bd-4c20-9ff6-fbf94fc94egg',
-          role: 'owner',
-          user: {
-            email: 'super2@owner.com',
-          },
-        },
-      ],
-      abilities: {
-        destroy: true, // Means owner
-        link_configuration: true,
-        versions_destroy: true,
-        versions_list: true,
-        versions_retrieve: true,
-        accesses_manage: true,
-        accesses_view: true,
-        update: true,
-        partial_update: true,
-        retrieve: true,
-      },
-      link_reach: 'public',
-      created_at: '2021-09-01T09:00:00Z',
-    });
-
-    await goToGridDoc(page);
+  test('it checks the element are correctly displayed', async ({
+    page,
+    browserName,
+  }) => {
+    await createDoc(page, 'doc-update', browserName, 1);
 
     const card = page.getByLabel(
       'It is the card information about the document.',
@@ -66,6 +28,18 @@ test.describe('Doc Header', () => {
     const docTitle = card.getByRole('textbox', { name: 'doc title input' });
     await expect(docTitle).toBeVisible();
 
+    await page.getByRole('button', { name: 'Share' }).click();
+
+    await page.getByLabel('Visibility', { exact: true }).click();
+
+    await page
+      .getByRole('menuitem', {
+        name: 'Public',
+      })
+      .click();
+
+    await page.getByRole('button', { name: 'close' }).first().click();
+
     await expect(card.getByText('Public document')).toBeVisible();
 
     await expect(card.getByText('Owner ·')).toBeVisible();
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx
index 9a486b58..fe419b80 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx
@@ -50,9 +50,10 @@ export const BlockNoteEditor = ({ doc, provider }: BlockNoteEditorProps) => {
   const { t } = useTranslation();
 
   const { isEditable, isLoading } = useIsCollaborativeEditable(doc);
+  const isConnectedToCollabServer = provider.isSynced;
   const readOnly = !doc.abilities.partial_update || !isEditable || isLoading;
 
-  useSaveDoc(doc.id, provider.document, !readOnly);
+  useSaveDoc(doc.id, provider.document, !readOnly, isConnectedToCollabServer);
   const { i18n } = useTranslation();
   const lang = i18n.resolvedLanguage;
 
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useSaveDoc.test.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useSaveDoc.test.tsx
index 0a20001d..a2f41938 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useSaveDoc.test.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useSaveDoc.test.tsx
@@ -41,7 +41,7 @@ describe('useSaveDoc', () => {
 
     const addEventListenerSpy = jest.spyOn(window, 'addEventListener');
 
-    renderHook(() => useSaveDoc(docId, yDoc, true), {
+    renderHook(() => useSaveDoc(docId, yDoc, true, true), {
       wrapper: AppWrapper,
     });
 
@@ -73,7 +73,7 @@ describe('useSaveDoc', () => {
       }),
     });
 
-    renderHook(() => useSaveDoc(docId, yDoc, false), {
+    renderHook(() => useSaveDoc(docId, yDoc, false, true), {
       wrapper: AppWrapper,
     });
 
@@ -107,7 +107,7 @@ describe('useSaveDoc', () => {
       }),
     });
 
-    renderHook(() => useSaveDoc(docId, yDoc, true), {
+    renderHook(() => useSaveDoc(docId, yDoc, true, true), {
       wrapper: AppWrapper,
     });
 
@@ -143,7 +143,7 @@ describe('useSaveDoc', () => {
       }),
     });
 
-    renderHook(() => useSaveDoc(docId, yDoc, true), {
+    renderHook(() => useSaveDoc(docId, yDoc, true, true), {
       wrapper: AppWrapper,
     });
 
@@ -164,7 +164,7 @@ describe('useSaveDoc', () => {
     const docId = 'test-doc-id';
     const removeEventListenerSpy = jest.spyOn(window, 'removeEventListener');
 
-    const { unmount } = renderHook(() => useSaveDoc(docId, yDoc, true), {
+    const { unmount } = renderHook(() => useSaveDoc(docId, yDoc, true, true), {
       wrapper: AppWrapper,
     });
 
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useSaveDoc.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useSaveDoc.tsx
index 274adcff..c6ca782e 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useSaveDoc.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useSaveDoc.tsx
@@ -10,7 +10,12 @@ import { toBase64 } from '../utils';
 
 const SAVE_INTERVAL = 60000;
 
-const useSaveDoc = (docId: string, yDoc: Y.Doc, canSave: boolean) => {
+const useSaveDoc = (
+  docId: string,
+  yDoc: Y.Doc,
+  canSave: boolean,
+  isConnectedToCollabServer: boolean,
+) => {
   const { mutate: updateDoc } = useUpdateDoc({
     listInvalideQueries: [KEY_LIST_DOC_VERSIONS],
     onSuccess: () => {
@@ -49,10 +54,18 @@ const useSaveDoc = (docId: string, yDoc: Y.Doc, canSave: boolean) => {
     updateDoc({
       id: docId,
       content: toBase64(Y.encodeStateAsUpdate(yDoc)),
+      websocket: isConnectedToCollabServer,
     });
 
     return true;
-  }, [canSave, yDoc, docId, isLocalChange, updateDoc]);
+  }, [
+    canSave,
+    isLocalChange,
+    updateDoc,
+    docId,
+    yDoc,
+    isConnectedToCollabServer,
+  ]);
 
   const router = useRouter();
 
diff --git a/src/frontend/apps/impress/src/features/docs/doc-header/components/AlertNetwork.tsx b/src/frontend/apps/impress/src/features/docs/doc-header/components/AlertNetwork.tsx
index b070356c..dd9cb3eb 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-header/components/AlertNetwork.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-header/components/AlertNetwork.tsx
@@ -32,7 +32,7 @@ export const AlertNetwork = () => {
           <Box $direction="row" $gap={spacingsTokens['2xs']} $align="center">
             <Icon iconName="mobiledata_off" $theme="warning" $variation="600" />
             <Text $theme="warning" $variation="600" $weight={500}>
-              {t('Your network do not allow you to edit')}
+              {t('Others are editing. Your network prevent changes.')}
             </Text>
           </Box>
           <BoxButton
@@ -50,7 +50,7 @@ export const AlertNetwork = () => {
               $margin={{ top: 'auto' }}
             />
             <Text $theme="warning" $variation="600" $weight="500" $size="xs">
-              {t('Know more')}
+              {t('Learn more')}
             </Text>
           </BoxButton>
         </Box>
@@ -74,8 +74,8 @@ export const AlertNetworkModal = ({ onClose }: AlertNetworkModalProps) => {
       onClose={() => onClose()}
       rightActions={
         <>
-          <Button aria-label={t('OK')} onClick={onClose}>
-            {t('OK')}
+          <Button aria-label={t('OK')} onClick={onClose} color="danger">
+            {t('I understand')}
           </Button>
         </>
       }
@@ -88,24 +88,39 @@ export const AlertNetworkModal = ({ onClose }: AlertNetworkModalProps) => {
           $align="flex-start"
           $variation="1000"
         >
-          {t("Why can't I edit?")}
+          {t("Why you can't edit the document?")}
         </Text>
       }
     >
       <Box
         aria-label={t('Content modal to explain why the user cannot edit')}
         className="--docs--modal-alert-network"
-        $margin={{ top: 'xs' }}
+        $margin={{ top: 'md' }}
       >
         <Text $size="sm" $variation="600">
           {t(
-            'The network configuration of your workstation or internet connection does not allow editing shared documents.',
+            'Others are editing this document. Unfortunately your network blocks WebSockets, the technology enabling real-time co-editing.',
           )}
         </Text>
-        <Text $size="sm" $variation="600" $margin={{ top: 'xs' }}>
-          {t(
-            'Docs use WebSockets to enable real-time editing. These communication channels allow instant and bidirectional exchanges between your browser and our servers. To access collaborative editing, please contact your IT department to enable WebSockets.',
-          )}
+        <Text
+          $size="sm"
+          $variation="600"
+          $margin={{ top: 'xs' }}
+          $weight="bold"
+          $display="inline"
+        >
+          {t("This means you can't edit until others leave.")}{' '}
+          <Text
+            $size="sm"
+            $variation="600"
+            $margin={{ top: 'xs' }}
+            $weight="normal"
+            $display="inline"
+          >
+            {t(
+              'If you wish to be able to co-edit in real-time, contact your Information Systems Security Manager about allowing WebSockets.',
+            )}
+          </Text>
         </Text>
       </Box>
     </Modal>
diff --git a/src/frontend/apps/impress/src/features/docs/doc-management/api/useDocCanEdit.tsx b/src/frontend/apps/impress/src/features/docs/doc-management/api/useDocCanEdit.tsx
new file mode 100644
index 00000000..8847ef94
--- /dev/null
+++ b/src/frontend/apps/impress/src/features/docs/doc-management/api/useDocCanEdit.tsx
@@ -0,0 +1,32 @@
+import { UseQueryOptions, useQuery } from '@tanstack/react-query';
+
+import { APIError, errorCauses, fetchAPI } from '@/api';
+
+type DocCanEditResponse = { can_edit: boolean };
+
+export const docCanEdit = async (id: string): Promise<DocCanEditResponse> => {
+  const response = await fetchAPI(`documents/${id}/can-edit/`);
+
+  if (!response.ok) {
+    throw new APIError('Failed to get the doc', await errorCauses(response));
+  }
+
+  return response.json() as Promise<DocCanEditResponse>;
+};
+
+export const KEY_CAN_EDIT = 'doc-can-edit';
+
+export function useDocCanEdit(
+  param: string,
+  queryConfig?: UseQueryOptions<
+    DocCanEditResponse,
+    APIError,
+    DocCanEditResponse
+  >,
+) {
+  return useQuery<DocCanEditResponse, APIError, DocCanEditResponse>({
+    queryKey: [KEY_CAN_EDIT, param],
+    queryFn: () => docCanEdit(param),
+    ...queryConfig,
+  });
+}
diff --git a/src/frontend/apps/impress/src/features/docs/doc-management/api/useUpdateDoc.tsx b/src/frontend/apps/impress/src/features/docs/doc-management/api/useUpdateDoc.tsx
index a012cf26..3660c005 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-management/api/useUpdateDoc.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-management/api/useUpdateDoc.tsx
@@ -1,10 +1,18 @@
-import { useMutation, useQueryClient } from '@tanstack/react-query';
+import {
+  UseMutationOptions,
+  useMutation,
+  useQueryClient,
+} from '@tanstack/react-query';
 
 import { APIError, errorCauses, fetchAPI } from '@/api';
 import { Doc } from '@/features/docs';
 
+import { KEY_CAN_EDIT } from './useDocCanEdit';
+
 export type UpdateDocParams = Pick<Doc, 'id'> &
-  Partial<Pick<Doc, 'content' | 'title'>>;
+  Partial<Pick<Doc, 'content' | 'title'>> & {
+    websocket?: boolean;
+  };
 
 export const updateDoc = async ({
   id,
@@ -24,25 +32,30 @@ export const updateDoc = async ({
   return response.json() as Promise<Doc>;
 };
 
-interface UpdateDocProps {
-  onSuccess?: (data: Doc) => void;
+type UseUpdateDoc = UseMutationOptions<Doc, APIError, Partial<Doc>> & {
   listInvalideQueries?: string[];
-}
+};
 
-export function useUpdateDoc({
-  onSuccess,
-  listInvalideQueries,
-}: UpdateDocProps = {}) {
+export function useUpdateDoc(queryConfig?: UseUpdateDoc) {
   const queryClient = useQueryClient();
   return useMutation<Doc, APIError, UpdateDocParams>({
     mutationFn: updateDoc,
-    onSuccess: (data) => {
-      listInvalideQueries?.forEach((queryKey) => {
+    ...queryConfig,
+    onSuccess: (data, variables, context) => {
+      queryConfig?.listInvalideQueries?.forEach((queryKey) => {
         void queryClient.invalidateQueries({
           queryKey: [queryKey],
         });
       });
-      onSuccess?.(data);
+
+      if (queryConfig?.onSuccess) {
+        void queryConfig.onSuccess(data, variables, context);
+      }
+    },
+    onError: () => {
+      void queryClient.invalidateQueries({
+        queryKey: [KEY_CAN_EDIT],
+      });
     },
   });
 }
diff --git a/src/frontend/apps/impress/src/features/docs/doc-management/hooks/useIsCollaborativeEditable.tsx b/src/frontend/apps/impress/src/features/docs/doc-management/hooks/useIsCollaborativeEditable.tsx
index 0bb4f8f2..1064e866 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-management/hooks/useIsCollaborativeEditable.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-management/hooks/useIsCollaborativeEditable.tsx
@@ -3,6 +3,7 @@ import { useEffect, useState } from 'react';
 import { useConfig } from '@/core';
 import { useIsOffline } from '@/features/service-worker';
 
+import { KEY_CAN_EDIT, useDocCanEdit } from '../api/useDocCanEdit';
 import { useProviderStore } from '../stores';
 import { Doc, LinkReach } from '../types';
 
@@ -13,31 +14,30 @@ export const useIsCollaborativeEditable = (doc: Doc) => {
   const docIsPublic = doc.link_reach === LinkReach.PUBLIC;
   const docIsAuth = doc.link_reach === LinkReach.AUTHENTICATED;
   const docHasMember = doc.nb_accesses_direct > 1;
+  const isUserReader = !doc.abilities.partial_update;
   const isShared = docIsPublic || docIsAuth || docHasMember;
-  const [isEditable, setIsEditable] = useState(true);
-  const [isLoading, setIsLoading] = useState(true);
   const { isOffline } = useIsOffline();
+  const _isEditable = isUserReader || isConnected || !isShared || isOffline;
+  const [isEditable, setIsEditable] = useState(true);
+  const [isLoading, setIsLoading] = useState(!_isEditable);
+
+  const {
+    data: { can_edit } = { can_edit: _isEditable },
+    isLoading: isLoadingCanEdit,
+  } = useDocCanEdit(doc.id, {
+    enabled: !_isEditable,
+    queryKey: [KEY_CAN_EDIT, doc.id],
+    staleTime: 0,
+  });
 
-  /**
-   * Connection can take a few seconds
-   */
   useEffect(() => {
-    const _isEditable = isConnected || !isShared || isOffline;
-    setIsLoading(true);
-
-    if (_isEditable) {
-      setIsEditable(true);
-      setIsLoading(false);
+    if (isLoadingCanEdit) {
       return;
     }
 
-    const timer = setTimeout(() => {
-      setIsEditable(false);
-      setIsLoading(false);
-    }, 5000);
-
-    return () => clearTimeout(timer);
-  }, [isConnected, isOffline, isShared]);
+    setIsEditable(can_edit);
+    setIsLoading(false);
+  }, [can_edit, isLoadingCanEdit]);
 
   if (!conf?.COLLABORATION_WS_NOT_CONNECTED_READY_ONLY) {
     return {