The following commands should return data if not you will need to work with your network admin staff to correct the DNS issue:
a) dig _ldap._tcp.<yourdomain> SRV
This command will check for a SRV record for your domain.
b)  # nslookup
> set type=srv
> _ldap._tcp.dc._msdcs.<yourdomain>
Here is output from our lab and your output should look similiar:
# nslookup
> set type=srv
> _ldap._tcp.dc._msdcs.LG.TS.HAL.CA.QSFT
Server:         10.4.64.23
Address:        10.4.64.23#53
Non-authoritative answer:
_ldap._tcp.dc._msdcs.LG.TS.HAL.CA.QSFT  service = 0 100 389 dc-plg2.lg.ts.hal.ca.qsft.
Authoritative answers can be found from:
dc-plg2.lg.ts.hal.ca.qsft       internet address = 10.5.84.114
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