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I was having the problem below, and couldn't find a reference to it in the forums, so here is my fix.
GLPI Version- 0.71.5
Problem- "Synchronizing already imported users" does not synchronise existing LDAP users.
I had incorrectly set up my LDAP/GLPI mappings, and the imported LDAP users came across with incorrect data. I updated the mappings and tried to synchronise by going to-
Users -> LDAP Link -> Synchronizing already imported users
This returned a page with "No users to be imported". User data was not updated.
LDAP appears to be working correctly otherwise (i.e. can successfully import new users, log in)
Workaround- Go to the Users page, and select users to be updated by checkbox. Then select "Force synchonisation" and click Post. Data is updated.
Cheers, hope this helps.
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