Port 445 taking up massive bandwidth, looking for explantion

Good morning fellow IT workers!
I was looking at my netflow data today and noticed that users on remote sites were bypassing their Domain Controllers and going right to the main office's. All of this traffic was on port 445 (MicrosoftAD) from user workstations and was just curious
as to why this may be happening. Within the past two weeks its taken up 13.9GB on the circuit. While I have some general knowledge of AD, I'm hoping you fine people could point me in a better direction as to why port 445 on user workstations is bypassing the
remote site DC and going straight to the main site DC.
Thank you in advance!

Hi,
How many users are there in the remote sites?
Is there file sharing service on the domain controller? The file sharing service also use TCP/UDP port 445.
The TCP/UDP port 445 is not used by Active Directory directly. It is used by SMB. The AD uses SMB to transmit data.
Please run the command below on the client. It will tell us that which process sends the traffic.
netstat -abon
Best Regards.
Steven Lee Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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