To lock or unlock a client only in an in R/3 System, run the following functions via tcode SE37:
SSCR_LOCK_CLIENT - run this function module using SE37 transaction and specify the name of the client to be locked. In this case the SAP default users will be able to login.
SSCR_UNLOCK_CLIENT - run this function module using SE37 to unlock the client.
Locking/unlocking the entire system, an admin can use the following commands:
1. tp locksys
2. tp unlocksys
- transport profile in /usr/sap/trans/bin usually -> TP_DOMAIN_.PFL
If you want to lock a client then another way is to lock all the users so that no one can log in to that particular client which can be done using transaction SU01 for small number of users and SU10 if there are large number of users.
Note Before you do mass locking of users in SU10 make sure you make a note of all the users who are already locked. Otherwise when you unlock the users in SU10 those locked users may alsp be unlocked.
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