Thank you for providing your time on this query.
Using internal name servers...not public DNS. Tried both LDAP (389) and LDAPS (636) but when FQDN is used in the LDAP server profile getting error: LDAP auth server down!!!
Works fine when IP address is used. Any bug that you are aware of?
Even using an internal DNS server your firewall will have to be able to resolve it correctly.
Every time you perform LDAP server communication (for example manual or automatic user group refresh, authentication LDAP query or similar LDAP actions) our system will perform DNS lookup and resolve IP address for configured FQDN for LDAP server in LDAP server profile.
From the CLI try 'ping host <FQDN hostname>' to confirm if your firewall resolves it correctly.
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