diff --git a/apps/client/src/services/server.ts b/apps/client/src/services/server.ts
index eb5d01382..978aa91ab 100644
--- a/apps/client/src/services/server.ts
+++ b/apps/client/src/services/server.ts
@@ -275,10 +275,19 @@ async function reportError(method: string, url: string, statusCode: number, resp
         });
     } else {
         const { t } = await import("./i18n.js");
-        toastService.showErrorTitleAndMessage(
-            t("server.unknown_http_error_title"),
-            t("server.unknown_http_error_content", { statusCode, method, url, message: messageStr }),
-            15_000);
+        if (statusCode === 400 && (url.includes("%23") || url.includes("%2F"))) {
+            toastService.showPersistent({
+                id: "trafik-blocked",
+                icon: "bx bx-unlink",
+                title: t("server.unknown_http_error_title"),
+                message: t("server.traefik_blocks_requests")
+            });
+        } else {
+            toastService.showErrorTitleAndMessage(
+                t("server.unknown_http_error_title"),
+                t("server.unknown_http_error_content", { statusCode, method, url, message: messageStr }),
+                15_000);
+        }
         const { throwError } = await import("./ws.js");
         throwError(`${statusCode} ${method} ${url} - ${message}`);
     }
diff --git a/apps/client/src/translations/en/translation.json b/apps/client/src/translations/en/translation.json
index c6f9beaad..d4619c96a 100644
--- a/apps/client/src/translations/en/translation.json
+++ b/apps/client/src/translations/en/translation.json
@@ -2110,6 +2110,7 @@
   },
   "server": {
     "unknown_http_error_title": "Communication error with the server",
-    "unknown_http_error_content": "Status code: {{statusCode}}\nURL: {{method}} {{url}}\nMessage: {{message}}"
+    "unknown_http_error_content": "Status code: {{statusCode}}\nURL: {{method}} {{url}}\nMessage: {{message}}",
+    "traefik_blocks_requests": "If you are using the Traefik reverse proxy, it introduced a breaking change which affects the communication with the server."
   }
 }