Liferay - Can't import LDAP users because of special characters

If you use the default LDAP configuration for Liferay 6.2, then you're in for a problem when it starts to import the users.

It is usual for the users in a LDAP server to have all sort of characters but the default configuration of Liferay doesn't allow all of them.

To get this fixed you'll have to add this property to your liferay configuration:

users.screen.name.validator = com.liferay.portal.security.auth.LiberalScreenNameValidator 

Then restart your server.