Regarding lock at SAP system

hay,
our client says, suddenly today SAP 40B Prod system does not allowusers to login to system. so we had restarted the server. but we would like to know the possible reason for this occurence.
could somebody guide me what are all things i have to check and what could be reason to get lock.
I checked Systemlog but could not able tojudge particular reason for it..is there any procedure to findout.
helps could be appreciated.
ambichan.

Hola Ambi,
there could be a lot of reason,
first one, you have dialog process, if all dialog process are busy ... you will not be abble to login to SAP. (I thing this case was not in the syslog).
seconde, maybe the table USR02 had some trouble, did you check the database table USR* ?
Regards
Frédéric

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