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Microsft IT Solutions for small and medium networks no RPC

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Microsft IT Solutions for small and medium networks no RPC - 11.Mar.2010 6:24:07 AM   
SteveWest

 

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Joined: 3.Nov.2005
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I have really been struggling to get users to collect mail from externally as they are sometime on a different network.
I have setup my systems based on the Microsoft Best Practices for small and medium networks to the exact same as the documentation.
I am now trying to publish exchange via secure RPC and the firewall is not even showing an attempt of any connection at all in the logs.
This has been a week pain in my butt.
Has anyone followed this practice and published exchange via secure rpc my mail server FQDN can be resolved from within the local network and from externally so i am now at a lose.
I have also followed Toms documentation on the publishing secure rpc.
All i can say is heck i would love my users to have outlook anywhere if i can get it to work.
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RE: Microsft IT Solutions for small and medium networks... - 11.Mar.2010 9:21:42 AM   
Rotorblade

 

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Joined: 27.Feb.2007
Status: offline
Can you provide a little more detail on your network topology and ISA NIC configurations? That would be helpful.

RB

_____________________________

David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to SteveWest)
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RE: Microsft IT Solutions for small and medium networks... - 12.Mar.2010 12:05:34 AM   
SteveWest

 

Posts: 9
Joined: 3.Nov.2005
Status: offline
Sorry i thought if someone was familiar with the Microsoft docs they would know the topology.

The isa server is in 2 nic config external resolves to 196.38.223.228
internal is on 10.0.0.1

Behind the firewall is a pdc and bdc the bdc also runs the exhange box, this address is 10.0.0.3. All dns is done internal with all server poointing to 10.0.0.2 primary and 10.0.0.3 secondary dns.
All server are securNAT with ISA as the gateway on address 10.0.0.1.
ISA Itself also points to the internal DNS, Any DNS that isnt resolved by our dns servers is then fowarded to external using dns forwarders in the dns server.
The Outlook clients point to srvexc.traffic.co.za which resolves to the mail server internally on 10.0.0.3 and to srvx.traffic.co.za(196.38.223.228 external nic of ISA) if the client is outside the network. All client are on XP and dont have windows wirewall enabled, servers are 2003.
Just to point out i have tested the secure publish and tried to connect externall with outlook, i dont see any info of this connection being made on the ISA server with loggin enabled, should i be seeing this RPC connection being established.

(in reply to Rotorblade)
Post #: 3
RE: Microsft IT Solutions for small and medium networks... - 12.Mar.2010 3:56:30 AM   
Jason Jones

 

Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline
Many Internet providers block RPC as it is not a common protocol that is used legitimately across the Internet, and it often connected to viruses/worms.

Have you considered using the RPC over HTTP feature of Exchange instead?

If not, have a look through these articles to check you setup:

http://www.isaserver.org/search.asp?s=exchange+rpc

Cheers

JJ

< Message edited by Jason Jones -- 12.Mar.2010 3:57:36 AM >


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Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to SteveWest)
Post #: 4

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