DMZ zone server

Mohammed mohammed
Mohammed mohammed used Ask the Experts™
Dear All

I am not able to join DMZ server into domain.
Error : The network path was not found"

I have opened the port as below:

LDAP TCP-in – 389
LDAP UDP in – 389
LDAP for Global Catalog TCP in – 3268
NetBIOS name Resolution UDP in – 138
SAM/LSA TCP in – 445
SAM/LSA UDP in – 445
Secure LDAP TCP in –  636
Secure LDAP for Global Catalog TCP in – 3269
W32Time NTP UDP in – 123
RPC – RPC Dynamic
RPC Endpoint Mapper
DNS – TCP and UDP 53
Kerberos V5 UDP in – 88
Netbios Datagram UDP in – 137
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Ravi Kumar AtreyCloud Specialist- Azure

Whether, DNS servers are correctly assigned and your domain is resolving to correct dns/AD server IP from the system running in DMZ?

Please check this.



Please let me know, what to do in RPC – RPC Dynamic and RPC Endpoint Mapper.

this I have not done.
bbaoIT Consultant

> I have opened the port as below:

please clarify which host (DMZ server, router or DC) are you referring to for opening the given ports?

FYI - it is not necessary to enable these ports on the DMZ server (client side) and DC server side.


I have opened the port on firewall and able to telnet from server to domain with ports.

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