UCS behind firwall Authentication failed

Hi I have fortinet firewall configured with Forward DNS zones setup for UCS server. Now when i add my server ip in Network adapter it popups for domain joining but when i add firewall Settings and DNS setup forwarder it gave me error below:

Note: This information is intended for a network administrator. If you are not your network’s administrator, notify the administrator that you received this information, which has been recorded in the file C:\Windows\debug\dcdiag.txt.

An error occurred when DNS was queried for the service location (SRV) resource record used to locate an Active Directory Domain Controller (AD DC) for domain “domusc.org.pk”.

The error was: “DNS request not supported by name server.”
(error code 0x0000232C RCODE_NOT_IMPLEMENTED)

The query was for the SRV record for _ldap._tcp.dc._msdcs.domusc.org.pk

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