RE: client behind ISA access to remote Exchange behind another ISA using MAPI
- From: "John Tolmachoff" <isalist@xxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 5 Mar 2003 16:49:37 -0800
This is interesting. See my reply to 307926.
In your case, is a site to site VPN possible? (It would have to be strictly
regulated.)
In my opinion, Exchange was never designed nor will it function properly to
serve as a mail server for non-local domains. It is the Lexus of corporate
e-mail servers. The key word is corporate.
If you have to have Exchange and you have to outsource, I would seriously
consider a on-site outsourced Exchange server, where it is in your office
but is entirely taken care of by someone else.
I have never heard of Exchange being used for a corporation where the
Exchange server was not within that company.
John Tolmachoff MCSE, CSSA
IT Manager, Network Engineer
RelianceSoft, Inc.
Fullerton, CA 92835
www.reliancesoft.com
> -----Original Message-----
> From: John Huang [mailto:jun@xxxxxxxxxxxxx]
> Sent: Wednesday, March 05, 2003 1:17 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] client behind ISA access to remote Exchange behind
another ISA
> using MAPI
>
> http://www.ISAserver.org
>
>
> Hi, Dr. Shinder:
>
> Our LAN is behind a integrated mode ISA. We are using SNAT client for LAN.
> Now we want to use outsourced Exchange, which also secured published
> behind ISA array. I am using Outlook 2002 SP-2 client, try to connect
> using MAPI to the remote Exchange but failed. Someone told me installing
> the lastest Feature Pack 1 but still not working. I tested by allowing my
> ISA wide open to all to try to connect the remote Exchange, still failed.
> Errow message said can not find the server and the mailbox name. Using
> sniffer to analyze the packet find that local Outlook client send some
> request call but not get reply by the remote Exchange but ISA, while if
> not SNAT in DMZ the client can get the reply and establish MAPI
> connection.
>
> After dig out some knowledge base, I found these info:
> http://support.microsoft.com/default.aspx?scid=3Dkb;en-us;307926
> http://support.microsoft.com/default.aspx?scid=kb;EN-US;263293
> http://support.microsoft.com/default.aspx?scid=kb;en-us;154596
>
> Is this mean that we can not use this kind of sevice or setup because of
> the RPC, NAT and Outlook GC? Any suggestion? or the beta 2 version of ISA
> will address this problem?
>
> Thank you very much for your advice.
>
>
> Best regards,
> John Huang
> System Administrator
>
>
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