You should consider using the RPC over HTTP method instead of just RPC. Number 1 most ISPs today block port 135, thus if any of your employees have notebook computers that need to access their emails, chances will be slim that the ISP they connect up with on the go will have port 135 open. RPC over HTTP uses ports 80, and 443 (SSL). Andrew -----Original Message----- From: adrian bolzan [mailto:abolzan@xxxxxxxxxxxxxxxxxxxxxxxxx] Sent: Friday, April 22, 2005 12:48 AM To: [ExchangeList] Subject: [exchangelist] RE: OT (sort of): Setting up an OWA server in a DMZ http://www.MSExchange.org/ Sorry, I should clarify the ports I have opened on the firewall. These were derived from the website: "Active Directory Replication over Firewalls" http://www.microsoft.com/technet/prodtechnol/windows2000serv/technologie s/activedirectory/deploy/confeat/adrepfir.mspx Although I did not want to configure a DC in the DMZ. I chose the swiss cheese method, Full Dynamic RPC. Thus, RPC endpoint mapper 135/tcp, 135/udp Network basic input/output system (NetBIOS) name service 137/tcp, 137/udp NetBIOS datagram service 138/udp NetBIOS session service 139/tcp RPC dynamic assignment 1024-65535/tcp Server message block (SMB) over IP (Microsoft-DS) 445/tcp, 445/udp Lightweight Directory Access Protocol (LDAP) 389/tcp LDAP over SSL 636/tcp Global catalog LDAP 3268/tcp Global catalog LDAP over SSL 3269/tcp Kerberos 88/tcp, 88/udp Domain Name Service (DNS) 53/tcp1, 53/udp I did not open these WINS ports Windows Internet Naming Service (WINS) resolution (if required) 1512/tcp, 1512/udp Nor these: WINS replication (if required) 42/tcp, 42/udp Cheers, Adrian > -----Original Message----- > From: adrian bolzan [mailto:abolzan@xxxxxxxxxxxxxxxxxxxxxxxxx] > Sent: Friday, 22 April 2005 1:04 PM > To: [ExchangeList] > Subject: [exchangelist] OT (sort of): Setting up an OWA > server in a DMZ > > http://www.MSExchange.org/ > > > Hi, > > This is sort of off-topic as I am stuck at setp 1 of building > an OWA server. > > I am trying to configure a new server to act as an OWA > server. It is located in our DMZ. > We do not use ISA server... > > IP address of 'OWA' server = 192.168.2.2 IP address of > Exchange server, which is also a DC = 192.168.1.5 > > The way our firewall works is to set an alias on the DMZ > interface, and use IP address and Port forwarding. > The alias on the DMZ interface = 192.168.2.5. > > Thus, communications from the 'OWA' server to the exchange > server is sent to 192.168.2.5, with IP address and port > forwarding to 192.168.1.5 > : > > 'OWA' server --> IP Alias on DMZ interface --> DC (with Exchange) > 192.168.2.2 --> 192.168.2.5 --> 192.168.1.5 > > > My first problem is that when I try to join the OWA server to > the domain across the firewall I receive an error stating > that I am trying to connect to a closed port (presumably on > the exchange DC). All of the appropriate filters are in > place on the firewall to allow the communication. The closed > port is 138/UDP. This suggests that I need to configure the > DC to allow connections from the DMZ subnet. > > Any pointers on where I would find info on how to allow this > communication would be appreciated. > > > > Cheers, > Adrian > > ============================================================ > IMPORTANT - This email and any attachments is confidential. > If received in error, please contact the sender and delete > all copies of this email. Please note that any use, > dissemination, further distribution or reproduction of this > message in any form is strictly prohibited. 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If received in error, please contact the sender and delete all copies of this email. Please note that any use, dissemination, further distribution or reproduction of this message in any form is strictly prohibited. Before opening or using attachments, check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files, our liability is limited to resupplying any affected attachments. Any representations or opinions expressed in this email are those of the individual sender, and not necessarily those of the Capital Transport Services. ============================================================ ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.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 MSEXchange.org Discussion List as: andrew@xxxxxxxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx