diff --git a/backend/internal/api/handlers/proxy_host_handler_test.go b/backend/internal/api/handlers/proxy_host_handler_test.go
index 477f7238..6233eeaf 100644
--- a/backend/internal/api/handlers/proxy_host_handler_test.go
+++ b/backend/internal/api/handlers/proxy_host_handler_test.go
@@ -1552,7 +1552,7 @@ func TestProxyHostUpdate_SecurityHeaderProfile_InvalidString(t *testing.T) {
 
 	var result map[string]any
 	require.NoError(t, json.Unmarshal(resp.Body.Bytes(), &result))
-	require.Contains(t, result["error"], "invalid security_header_profile_id")
+	require.Contains(t, result["error"], "security header profile not found")
 }
 
 // Test invalid float value (should fail gracefully)
diff --git a/frontend/src/components/__tests__/ProxyHostForm.test.tsx b/frontend/src/components/__tests__/ProxyHostForm.test.tsx
index 665e384b..5117e514 100644
--- a/frontend/src/components/__tests__/ProxyHostForm.test.tsx
+++ b/frontend/src/components/__tests__/ProxyHostForm.test.tsx
@@ -1311,7 +1311,7 @@ describe('ProxyHostForm', () => {
       await userEvent.type(screen.getByLabelText(/^Host/), '192.168.1.100')
       await userEvent.type(screen.getByLabelText(/^Port/), '80')
 
-      const advancedConfigField = screen.getByPlaceholderText('Additional Caddy directives...')
+      const advancedConfigField = screen.getByRole('textbox', { name: /Advanced Caddy Config/i })
       await userEvent.type(advancedConfigField, 'header /api/* X-Custom-Header "test"')
 
       await userEvent.click(screen.getByText('Save'))