> Source: [sk175604](https://support.checkpoint.com/results/sk/sk175604)

# sk175604 - Endpoint Security Client disconnects after rejoining an old Active Directory

| Property | Value |
|----------|-------|
| Solution ID | sk175604 |
| Date Created | 2021-09-29 |
| Last Modified | 2021-09-30 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X |

## Symptoms

- After moving to a new Active Directory according to procedure in [sk90520](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk90520), and re-joining the original (old) Active Directory, 
the Endpoint Security Client status is "Disconnected".

## Cause

The SID of the device is changed after joining a new AD. When re-joining the old AD it disconnect from the server since the client treats it as a deleted item in the old AD.

## Solution

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

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