> Source: [sk183829](https://support.checkpoint.com/results/sk/sk183829)

# sk183829 - Full Disk Encryption - User Acquisition failure when using Microsoft AutoLogon

| Property | Value |
|----------|-------|
| Solution ID | sk183829 |
| Date Created | 2025-08-22 |
| Last Modified | 2025-08-25 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | E89.X, E88.X |
| OS | Windows |

## Symptoms

- User is not acquired by Full Disk Encryption when using Microsoft AutoLogon

## Cause

When using Full Disk Encryption (FDE) with Microsoft's AutoLogon feature, user acquisition may fail if the system logs in before establishing a network connection.  

FDE requires the ability to retrieve the Security Identifier (SID) of the user during logon. If Windows login occurs before a network connection is available, the SID lookup may fail. This issue is common when using a DNS-based domain name in the AutoLogon configuration (e.g., contoso.com), which requires network connectivity to resolve domain information.

## Solution

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

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