> Source: [sk183277](https://support.checkpoint.com/results/sk/sk183277)

# sk183277 - Uninstallation of Harmony Endpoint Security Client failed with "Error 26801. Failed to stop driver (cpepmon)"

| Property | Value |
|----------|-------|
| Solution ID | sk183277 |
| Date Created | 2025-03-24 |
| Last Modified | 2025-03-25 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | E89.X, E88.X |
| OS | Windows |

## Symptoms

- Uninstallation process of the Harmony Endpoint Security Client take approximately 20 minutes and then fails with `Error 26801. Failed to stop driver (cpepmon)`

## Cause

During the uninstallation process, the system attempts to unregister the Harmony Endpoint Security client from the Security Management server. However, the client failed to connect to the server.  

The system makes five connection attempts, each failing after 3 minutes. This resulted in a prolonged uninstallation process. After all retries are exhausted, the operation fails.  

The `cpda.log` file shows the following error: `Failed to connect to SMIPR-xxxx.epmgmt.checkpoint.com port 443 after 168328 ms: Couldn't connect to server.`

## Solution

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