Lock Client of SAP system

 1. SCCR_LOCK_CLIENT (to lock the client)

2. SCCR_UNLOCK_CLIENT (to unlock the client)

This function is used to lock \ unlock client from logins. When you lock a client, all users try to log on A client will show message “A client currently blocked from entering.” A client will be available for entry only available to users SAP * and DDIC.

To lock:

1. Run t-code : SE37
2. Enter the name of the module SCCR_LOCK_CLIENT
3. Press F8 to activate

4. Enter the number of client and press (F8).

To unlock:

1. Run t-code : SE37
2. Enter the name of the module SCCR_UNLOCK_CLIENT
3. Press F8 to activate
4. Enter the number of client and press (F8).

My reference:

https://blogs.sap.com/2014/12/02/lock-client-of-sap-system/