diff --git a/src/view/Office.vue b/src/view/Office.vue
index ae4521be9f..214dfdac79 100644
--- a/src/view/Office.vue
+++ b/src/view/Office.vue
@@ -303,6 +303,7 @@ export default {
 					this.loading = LOADING_STATE.FRAME_READY
 					this.$emit('update:loaded', true)
 					FilesAppIntegration.initAfterReady()
+					this.sendPostMessage('Error_Messages', { websocketconnectionfailed: 'Failed to establish socket connection or socket connection closed unexpectedly. The reverse proxy might be misconfigured, please contact the administrator. For more info on proxy conifguration please checkout https://docs.nextcloud.com/server/latest/admin_manual/office/proxy.html' })
 				} else if (args.Status === 'Document_Loaded') {
 					this.documentReady()
 				} else if (args.Status === 'Failed') {