> Source: [sk183463](https://support.checkpoint.com/results/sk/sk183463)

# sk183463 - Harmony Endpoint Web Management GUI Unavailable with HTTP 503 Error

| Property | Value |
|----------|-------|
| Solution ID | sk183463 |
| Date Created | 2025-05-14 |
| Last Modified | 2025-08-06 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | R81.20 |

## Symptoms

- * Users are unable to log in to the Harmony Endpoint Security Server Web Management Graphical User Interface (GUI).
* HTTP 503 error displayed on the login screen "Sorry, we had a network issue during the request" message shown on Web UI.
* Manual recovery attempts (e.g., file permission checks, service restarts) do not resolve the issue.
* Upgrade of Harmony Endpoint Management server (for example: from R81.20 Take 76 or Take 92 or Take 96) fails with an error: Internal error. Internal error in a hook script: bin/hook_uepm_HOTFIX_R81_20_JUMBO_HF_MAIN. (Return Code: 42). Contact Check Point Technical Services for further assistance (See Case 1)
* Log Analysis displays: Backend connection errors (proxy errors), Port mismatches (service listening on port 7779, but proxy attempting port 7778), and new log events appear in older log files. (See Case 1)
* SmartConsole works on the same subnet, but the Web Management UI does not. (See Case 2)
* Web Management Service health check fails. (See Case 2)
* Errors in web-mgmt.sh script: Failed to generate API_KEY Requested object \[web_mgmt_admin\] not found (See Case 2)

## Cause

This issue can arise in the following cases:  
**Case 1** - Invalid Docker Cache Entries  
Stale entries in the Docker cache used by the web management service prevent the service from starting correctly.   
**Case 2** - Incorrect Time Zone Configuration  
Incorrect time zone format in the Gaia Portal prevents API authentication and the creation of the required web_mgmt_admin user.

## Solution

This solution requires authentication. Please log in to view the full solution.

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