Hi John, With ISA Exchange RPC publishing, it just opens 135 inbound, and only for the Exchange specific UUIDs. If you don't use ISA, then you allow 135 inbound for any UUID, and then you have to open all high number ports inbound, since the server can assign itself any ephemeral port. Check out: http://support.microsoft.com/default.aspx?scid=kb;EN-US;148732 It has good info and links on the problematic nature of doing this without ISA. Thanks! Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx] Sent: Monday, July 14, 2003 11:40 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: FYI: ISA on SBS http://www.ISAserver.org First off, I have to admit I am not familiar with the technical side of RPC publishing. What port ranges are used and how does it work? John Tolmachoff MCSE CSSA Engineer/Consultant eServices For You www.eservicesforyou.com -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx] Sent: Monday, July 14, 2003 9:21 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: FYI: ISA on SBS http://www.ISAserver.org Hi John, Yes please! I'd like to hear more of your observations on this. However, the problem with the sonicwall firewall setup is that if you run ISA Server 2000 on the SBS box that runs the Exchange Server, you cannot avail external users of Exchange RPC publishing. The only way to do this is to disabling packet filtering, in which case, there's no point to even installing ISA Server, since its no longer a firewall without packet filtering protection. The Problem is that there's no way to disable RPC socket pooling. When you can't disable socket pooling, you can't create Server Publishing or Web Publishing Rules on that socket. The only other option is to create packet filters, but in order to create packet filters, you have to open the entire ephermal range of ports using static packet filters, which gets back to the poor security provided by tradition packet filtering based devices like PIX or sonicwall, and the reason why you want an ISA based appliance in front of the SBS box so that the customer is able to fully take advantage of the Exchange Server and remote Outlook 2000/2002/2003 client. Thanks! Tom Thomas W Shinder www.isaserver.org/shinder <http://www.isaserver.org/shinder> ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp <http://tinyurl.com/1llp> ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: tshinder@xxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')