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To refresh the page, click on the refresh icon 
at the top-right corner of the screen.
Note
1. On each client environment the settings can be different.
2. The "Network" section need to be define to the network card that have access to the LDAP server.
3. The "Host" (is specified by name and not IP) and will work only if the DNS and the LDAP server are at the same network card.