Why Frontend server need TCP port 53

  • From: "ONG Liang Bu (CSC)" <lbong@xxxxxxxxxx>
  • To: "'exchangelist@xxxxxxxxxxxxx'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 11 Nov 2002 21:30:21 +0800

Need an answer for this to the management.

For the Frontend - Backend configuration as this technet article

Management is asking on TCP/UDP port 53 that needs to be open up.
For UDP 53 is the name queries so no issues, but for TCP 53, is asking for
DNS zone
transfer which violate some security issue.  Anybody knew why need TCP port
From the article the frontend server is not running DNS and has to go back
to the DC
for DNS queries, stuck in this for the past 2 days, any reason? anyone?
Thanks, much appreciated.

Ong LB
Exchange Admin
National Institute of Education
Nanyang Technological Univeristy

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