Trusts and RPC

  • Thread starter Thread starter Eric Smith
  • Start date Start date
E

Eric Smith

Can anyone give me a definitive answer as to what trust scenarios
require RPC and ephemeral port availability? In the context of the
following:

NT4 to NT4
NT4 to AD(MIXED)
NT4 to AD(NATIVE)
AD(MIXED) to AD(NATIVE)
AD(NATIVE) to AD(NATIVE)

Any feedback is greatly appreciated.
 
Hi Eric,

Thank you for posting!

It seems you are going to configure firewalls for Domain trusts, right?

RPC is required in all the situations. Windows 2000 DNS servers use
ephemeral client-side ports when they query other DNS servers.

I recommend you read the article below:

179442 How to Configure a Firewall for Domains and Trusts
http://support.microsoft.com/?id=179442

Hope this helps. Thank you!

Regards,
Bennie Chen
Product Support Services
Microsoft Corporation

This posting is provided "AS IS" with no warranties, and confers no rights.
 
Ok when limiting the port range through a firewall, using
the following article as a reference:
http://support.microsoft.com/default.aspx?scid=kb;EN-
US;154596

If I have 5 trusts, 4 of which have ephemeral port ranges
open, and one that doesn't, will all 5 trust relationships
use the port range I specify in the
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
Value? Along those same lines, will both ends of the
communication require the same port mapping? Or does the
server dictate the dynamic port which RPC will use? The
reason I ask is to avoid having to co-ordinate changes
across a large organization.

I guess what I'm really getting at is will the
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
value dictate the port range for all RPC communication for
a machine? I noticed in q179442 it states "Note that
there may be hosts functioning with both client and server
roles on both sides of the firewall. Because of this,
ports rules may need to be mirrored" Does this mean all
clients and servers will need to have the necessary value
set in
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
in order for communication to be restricted to a specified
port range?

Thanks again!
Eric Smith
 
Hi Eric,

Thanks for the reply! I am adding one point here.

First, the article 154596 is used to configure the dynamic port for the
client. As the DC may act as both the RPC server and RPC client, you need
to configure the port range on all the computers. If you do not configure
it on one of the computer, this computer will use an available port when it
works as client.

Have a nice day!

Sincerely,

Damon Xu
MCSE2000, MCDBA2000
Microsoft Online Partner Support


Get Secure! - www.microsoft.com/security

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| Subject: RE: Trusts and RPC
| Date: Wed, 6 Aug 2003 10:33:52 -0700
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| X-Tomcat-NG: microsoft.public.win2000.networking
|
| Ok when limiting the port range through a firewall, using
| the following article as a reference:
| http://support.microsoft.com/default.aspx?scid=kb;EN-
| US;154596
|
| If I have 5 trusts, 4 of which have ephemeral port ranges
| open, and one that doesn't, will all 5 trust relationships
| use the port range I specify in the
| HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
| Value? Along those same lines, will both ends of the
| communication require the same port mapping? Or does the
| server dictate the dynamic port which RPC will use? The
| reason I ask is to avoid having to co-ordinate changes
| across a large organization.
|
| I guess what I'm really getting at is will the
| HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
| value dictate the port range for all RPC communication for
| a machine? I noticed in q179442 it states "Note that
| there may be hosts functioning with both client and server
| roles on both sides of the firewall. Because of this,
| ports rules may need to be mirrored" Does this mean all
| clients and servers will need to have the necessary value
| set in
| HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet\Ports
| in order for communication to be restricted to a specified
| port range?
|
| Thanks again!
| Eric Smith
|
| >-----Original Message-----
| >Hi Eric,
| >
| >Thank you for posting!
| >
| >It seems you are going to configure firewalls for Domain
| trusts, right?
| >
| >RPC is required in all the situations. Windows 2000 DNS
| servers use
| >ephemeral client-side ports when they query other DNS
| servers.
| >
| >I recommend you read the article below:
| >
| >179442 How to Configure a Firewall for Domains and Trusts
| >http://support.microsoft.com/?id=179442
| >
| >Hope this helps. Thank you!
| >
| >Regards,
| >Bennie Chen
| >Product Support Services
| >Microsoft Corporation
| >
| >This posting is provided "AS IS" with no warranties, and
| confers no rights.
| >
| >.
| >
|
 
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