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Domain controller not responding to client request

Our company has branches which is connected by VPN and wireless

I have installed additional DC/DNS in branches as per below discussion but it seems like there is some misconfiguration as when the wireless or VPN is not connected users(PCs) will take 5-10 minutes to login. Folder redirection also enabled for these users.
https://www.experts-exchange.com/questions/27194599/Suggestion-on-installing-domain-controller.html

I installed ADC and DNS server in branches to avoid this but it seems like users(PCs) are looking for DC in the head office.

Your help is highly appreciated to sort out this issue.
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Radhakrishnan
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It is GC as well
Sorry for not mentioning that b4
O.k then it should be related to dns. Have a look at this article msmvps.com/blogs/acefekay/archive/2010/01/03/the-dc-locator-process-the-logon-process-controlling-which-dc-responds-in-an-ad-site-and-srv-records.aspx

let us know for further assist.
Is your Sites Server handling DHCP for your workstations? Your not using a router for it are you?
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we have created a Vlan for it. There is DHCP in the remote locations
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Please check these events I forgot to mention this before

event ID 1925 : the attempt to establish a replication link for the following writable directory partition
Event ID 1053 : windows cannot determine the user or computer name (access denied) Group policy processing aborted


I tried Googling  but solutions didn't work
from a client machine do a nslookup to the local  dns server
are all of the branch offices able to contact the man ad/dns server?
you may have hq.abc.com ny.abc.com fla.abc.com nev.abc.com la.abc.com eur.abc.com
these all have to be able to connect and have a trust relationship with hq.abc.com
Global Catalog Server      TCP      3268-3269
LDAP Server      TCP/UDP      389
LDAP SSL      TCP/UDP      636
IPsec ISAKMP      UDP      500
NAT-T      UDP      4500
RPC      TCP      135

unless you have a vpn between the sites you will have to use NAT routing from the router to the DNS/AD servers
work on one site at a time once you get dns/ad replication working between the 2 DNS/AD servers you can use the knowledge you have gained
to configure the remainder.

it is pretty obvious that there is not a trust relationship between the hq/branch sites and ad is not being replicated.
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Majority of these are connected through wireless not by VPN.

all branches have ADC not another domain/child domain
This shouldn't be so complicated.

1. Make sure the Client uses the Local DC in it's TCP/IP Setting.  I would recommend that be the only DNS listed.

2. Setup the AD Sites & Services correctly.  THAT is what associates the Client to the correct DC

If these don't seem to be behaving properly then you need to make sure these two things were done correctly to begin with.
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Thanks