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RPC Publishing problem

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RPC Publishing problem - 5.Mar.2005 1:54:00 PM   
rpetruni

 

Posts: 25
Joined: 17.Apr.2003
Status: offline
Hi all,

Have a problem pulishing Exchange - the only thing frustrating me is that this is NOT the first time i'm publishing exchange, but it's the first time i'm not able to do it :-(
ISA has 6 NIC's (currently only 3 enabled, but soon the other 3 will be enabled too).
One of 3 enabled NIC's is External (default) connected to internet over Cisco router. The other 2 are INTERNAL networks.
Firewall Policies are working ok, between all 3 networks.
If i publish RPC, and watch the logs, ISA passes those packets over 135, 1025, .. ports out to exchange server (located on other internal network), but no packets are send back to client ???. ISA adapter on this side has 7 network ID's and there are accualy 7 networks connected on this adapter trough VLAN router configured to use Asymetric VLAN (ISA adapter is member on all 7 networks. Networks can not talk to eachother, and there is no problem with ISA comunication except when i publish something).
If i define Firewall policy between those networks - there is no problem, if i try to publish mail, web or any server it's not working. Exchange serve IS Secure NAT client.
What could be wrong here? Is it possible to publish something on one internal network to other internal network or not? Rule between those internal networks is ROUTE, does it has to be NAT?
Robert
Post #: 1
RE: RPC Publishing problem - 5.Mar.2005 7:17:00 PM   
WyldWolf

 

Posts: 246
Joined: 3.Mar.2005
From: Wisconsin
Status: offline
What's the default gateway of the Exchange server, the ISA or the layer 3 switch? If it's the layer 3 switch are there any ACL's in place that could be preventing this traffic? Also is that NAT and/or ACL's on the external internet Cisco router?

(in reply to rpetruni)
Post #: 2
RE: RPC Publishing problem - 5.Mar.2005 10:30:00 PM   
rpetruni

 

Posts: 25
Joined: 17.Apr.2003
Status: offline
ISA is default gateway for Exchange server. There are no ACL's on Layer 3 switch preventing it to allow trafic from exchange server to client. There is NAT on Cisco router, but in this case traffic is going from one internal network to other internal network NOT accross external network

Simpified diagram...


(in reply to rpetruni)
Post #: 3
RE: RPC Publishing problem - 5.Mar.2005 11:02:00 PM   
WyldWolf

 

Posts: 246
Joined: 3.Mar.2005
From: Wisconsin
Status: offline
Ok a couple more questions. What does the LAT on your ISA look like? You made it sound like other IP communications to the Exchange server are working throught the ISA server?

(in reply to rpetruni)
Post #: 4
RE: RPC Publishing problem - 5.Mar.2005 11:48:00 PM   
rpetruni

 

Posts: 25
Joined: 17.Apr.2003
Status: offline
ISA 2k4 does not have LAT ;-)
Routing table is correct, everything defined in ISA policy is working between those networks except publishing (Server, Mail, Web)...

Robert

(in reply to rpetruni)
Post #: 5
RE: RPC Publishing problem - 22.Mar.2005 10:19:00 AM   
rpetruni

 

Posts: 25
Joined: 17.Apr.2003
Status: offline
The solution was to enable NAT rule between those networks (that was originaly my question - is it possible to publish server when network relationship is route - probably NOT).

Robert

(in reply to rpetruni)
Post #: 6

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