Use the ldapmodify command to set the value of nsIdleTimeout.
The following command sets the idle timeout for Barbara Jensen to five minutes (300 seconds):
$ ldapmodify -D cn=admin,cn=Administrators,cn=config -w - Enter bind password: dn: uid=bjensen,ou=people,dc=example,dc=com changetype: modify add: nsIdleTimeout nsIdleTimeout: 300 ^D modifying entry uid=bjensen,ou=people,dc=example,dc=com ^D |