diff --git a/tests/e2e/ui/integration.config.ts b/tests/e2e/ui/integration.config.ts
index e332c865222..55ccb860512 100644
--- a/tests/e2e/ui/integration.config.ts
+++ b/tests/e2e/ui/integration.config.ts
@@ -23,6 +23,8 @@ export default defineConfig({
   use: {
     ...devices["Desktop Chrome"],
     baseURL: UI_BASE_URL,
+    // The proxy closes idle keep-alive sockets after 5s and a reused one fails with "socket hang up"
+    extraHTTPHeaders: { Connection: "close" },
     actionTimeout: 15_000,
     navigationTimeout: 30_000,
     trace: "retain-on-failure",
diff --git a/tests/e2e/ui/tests/integrationCritical/mcpUserEnvVars.spec.ts b/tests/e2e/ui/tests/integrationCritical/mcpUserEnvVars.spec.ts
index fee09b409c7..11cc1c948a3 100644
--- a/tests/e2e/ui/tests/integrationCritical/mcpUserEnvVars.spec.ts
+++ b/tests/e2e/ui/tests/integrationCritical/mcpUserEnvVars.spec.ts
@@ -12,7 +12,7 @@ import { captureRequestBody } from "../../helpers/roundTrip";
 import { masterKey } from "../../helpers/traffic";
 
 const master = masterKey();
-const headers = { Authorization: `Bearer ${master}`, Connection: "close" };
+const headers = { Authorization: `Bearer ${master}` };
 const TOKEN = "USER_TOKEN";
 
 type EnvVarStatus = {