> Source: [sk184449](https://support.checkpoint.com/results/sk/sk184449)

# sk184449 - LAN1 is not displayed as a selectable port when configuring a Link Aggregation Group in the Spark Firewall WebUI

| Property | Value |
|----------|-------|
| Solution ID | sk184449 |
| Date Created | 2025-12-17 |
| Last Modified | 2025-12-18 |
| Technical Level | General |
| Products | Spark Firewall (Locally Managed) |
| Versions | R81.10.X |
| Platform | 1570R, 1575R, 1500, 1900, 2000, 1600, 1800, 1595R |

## Symptoms

- When configuring a Link Aggregation Group (LAG) for Internet connectivity on Quantum Spark Appliances, LAN1 does not appear as a selectable port in the Web User Interface (WebUI).

The issue occurs on firmware version R81.10.17 (builds 996004721 and 996004653).

Additional Observations:

* The issue is limited to the WebUI display only.
* The LAG can be successfully configured using the Command Line Interface (CLI).
* When configured via the CLI, the LAG operates normally. Below is Example CLI output:
  >
  > ```
  > 
  > show configuration interface
  > ...
  > interface lag1
  >    member LAN1
  >    member LAN2
  > ...
  > ```

## Cause

A WebUI display issue prevented LAN1 from being displayed as a selectable port when configuring a LAG for Internet connectivity.

The backend logic and CLI were not affected, which is why the configuration works correctly when applied via the CLI.

## Solution

**Important**: Always back up your configuration before performing a firmware upgrade.

This problem was fixed. The fix is included starting from:

* [R81.10.17 build 4788](https://support.checkpoint.com/results/sk/sk183153)

After the upgrade, log in to the WebUI and confirm that LAN1 is available as a selectable port when configuring a LAG for Internet connectivity.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content