---
description: SU01,SU10 code used for lock and unlock. In case you want to block users temporarily from the system, lock and unlock functions are used.
title: How to Lock (SU01) & Unlock (SU10) a SAP User
image: https://www.guru99.com/images/lockunlock-a-user-2.png
---
[Skip to content](#main)
## Locking a user
The Purpose of locking user is to temporarily deactivate the users so that they cannot longer access the system.
Users can be locked in 2 ways:-
* Automatically
* Explicitly/Forcefully
**Automatically: –** There are two possibilities when users get lock automatically
* Maximum number of failed attempts:- controlled via the parameter **login/fails\_to\_user\_lock.** If a value is set to 3 it means after 3 failed attempts user will be locked.
* Auto unlock time: – “**login/failed\_user\_auto\_unlock**” defines whether user locked due to unsuccessful [logon attempts](https://www.guru99.com/how-to-limit-logon-attempts.html) should be automatically removed at midnight.
**Explicitly/Forcefully:** We can lock and unlock users in 2 ways-
1. Lock single user (**SU01**)
2. Lock multiple user (**SU10**)
## Procedure to lock a single user
**Step 1)** Execute T-code **SU01**
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F1.png)
**Step 2)** Enter a username in **User** field.
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F2.png)
**Step 3)** Press **Lock/Unlock** button
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F3.png)
**Step 4)** In the next screen, Press **Lock** button again to lock the user.
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F4.png)
## Procedure to lock multiple users
**Step 1)** Execute T-code **SU10**
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F5.png)
**Step 2)** Enter users a username in **User** field.
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F6.png)
**Step 3)** Press **Lock/Unlock** button
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F7.png)
All the users listed will be locked
## Procedure to unlock a user
**Step 1)** Execute T-code **su01**
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F8.png)
**Step 2)** Enter username in **User** field.
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F9.png)
**Step 3)** Press **Lock**/**Unlock** button
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F10.png)
**Step 4)** Press **Unlock** button
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F11.png)
## Procedure to unlock multiple users
**Step 1)** Execute T-code **SU10**
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F12.png)
**Step 2)** Enter users’ username in **User** field.
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F13.png)
**Step 3)** Press **Unlock** button
[](https://www.guru99.com/images/sap/2013/05/051413%5F0752%5F14.png)
Users will be unlocked
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