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ISA Server News top

Jul 22nd, 2008 - 64bit RPC traffic fails across ISA Sever 2006
Yuri Diogenes comes up with an interesting problem related to RPC communications between two 64bit hosts when there is an ISA firewall between them. The good news is that ISA 2006 SP1 fixes the problem. Check out the details at: https://blogs.technet.com/isablog/archive/2008/07/21/64-bit-rpc-traffic-fails-across-isa-sever-2006.aspx HTH, Tom Thomas W Shinder, M.D
Sep 6th, 2007 - How to Enable Integrated Authentication for Outlook RPCHTTP Clients to Prevent Authentication Prompts with 2006 ISA Firewalls
From Jim Harrison and confirmed by Jason Jones: No; I'm saying that if CIO-JerkyBoy is intent on a no-prompt user experience, Amy will have to: configure his OL to use NTLM (you probably overlooked this one) and point it to the oa.domain.tld listener create two listeners for Exch; one for OA and an
Aug 16th, 2007 - Jim Harrisons Definitive Guide on Troubleshooting RPCHTTP Publishing
That's right! Jim has created a new guide to troubleshooting RPC/HTTP publishing. If you have any problems with your RPC/HTTP publishing, you need to check out Jim's guide first. If you still can't figure out the problem, then come on over to the ISAserver.org Web boards and we'll see what we can do to help
May 16th, 2007 - Help for the ISA Firewall RPC Protocol Challenged
The ISA Firewall's RPC filter is one of the nice differentiators that makes the ISA Firewall most secure and more flexible than just about any other firewall on the market today. However, there are some scenarios where that RPC filter can drive you crazy! For example, have you ever tried to use the Certificates MMC from the ISA Firewall to obtain a Computer Certificate from your online enterprise CA? If so, then you know what I mean
Apr 20th, 2007 - DNS RPC Exploit May Need Immediate Attention by ISA Firewall Administrators
Microsoft recently reported a nasty RPC related DNS exploit that can disable or allow complete control of computers that have Microsoft DNS services running on them. You can see a detailed description of the problem in George Ou's blog at http://blogs.zdnet.com/Ou/?p=472 My first thought about the problem was that its not really a problem for well designed networks that use perimeterization and least privilege
May 3rd, 2006 - ISA 2006 Enables FBA and ActiveSyncRPCHTTP on the Same Web Listener
As you know, the best way to secure your Exchange Server organization is to put an ISA firewall in front of it. Unlike traditional hardware firewalls, the ISA firewall is purpose designed to protect Exchange Servers and services. Remote access to OWA, OMA, Exchange ActiveSync, and RPC/HTTP is critical for any business running Microsoft Exchange Servers

Blogs top

May 22nd, 2009 - Outlook RPCHTTP Client Locks Out User Account through ISA Firewall
Consider the following scenario: In Microsoft Internet Security and Acceleration (ISA) Server 2006 with Service Pack 1 (SP1), you publish a Microsoft Exchange Server 2003-based server. When you publish the Exchange server, you select the Outlook RPC/HTTP(s) option
Jan 29th, 2009 - Error 64 RPCHTTP through the ISA Firewall Its not the Firewalls fault Case 669874521
An external user is unable to connect to the Exchange 2007 RPC/HTTP Web site. But internal users are able to. Clearly, the problem is with the ISA firewall, right? WRONG. Remember, in over 99% of cases when the ISA firewall is correctly configured, it's not the firewall's fault -- it's something else causing the problem. Check out this article by Yuri Diogenes that explicates the problem with the Exchange CAS that caused a situation that made it look like an ISA firewall issue
Jan 12th, 2009 - Mohit Saxenas List of UUIDs for ISATMG Firewall Control over RPC
If you've been working with the ISA or TMG firewall for awhile, you might know that you can find tune security for RPC connections through the firewall using UUID information in custom RPC protocol definitions. The main challenge to getting this to work is know the right UUIDs to include in your Protocol Definitions. To this end, Mohit Saxena from Microsoft PSS come to your aid with a list of UUIDs that he's kept track of
Jul 22nd, 2008 - 64bit RPC traffic fails across ISA Sever 2006
Yuri Diogenes comes up with an interesting problem related to RPC communications between two 64bit hosts when there is an ISA firewall between them. The good news is that ISA 2006 SP1 fixes the problem. Check out the details at: https://blogs.technet.com/isablog/archive/2008/07/21/64-bit-rpc-traffic-fails-across-isa-sever-2006.aspx HTH, Tom Thomas W Shinder, M.D
Sep 6th, 2007 - How to Enable Integrated Authentication for Outlook RPCHTTP Clients to Prevent Authentication Prompts with 2006 ISA Firewalls
From Jim Harrison and confirmed by Jason Jones: No; I'm saying that if CIO-JerkyBoy is intent on a no-prompt user experience, Amy will have to: configure his OL to use NTLM (you probably overlooked this one) and point it to the oa.domain.tld listener create two listeners for Exch; one for OA and an
Aug 16th, 2007 - Jim Harrisons Definitive Guide on Troubleshooting RPCHTTP Publishing
That's right! Jim has created a new guide to troubleshooting RPC/HTTP publishing. If you have any problems with your RPC/HTTP publishing, you need to check out Jim's guide first. If you still can't figure out the problem, then come on over to the ISAserver.org Web boards and we'll see what we can do to help
Aug 14th, 2007 - Testing RPC over HTTP through ISA Server 2006
You can read Jim Harrison's definitive guide at: Testing RPC over HTTP through ISA Server 2006 Part 1; Protocols, Authentication and Processing Testing RPC over HTTP through ISA Server 2006 Part 2; Test Tools and Strategies Testing RPC over HTTP through ISA Server 2006 Part 3; Common Failures and Resolutions HTH, Stefaan
Jun 27th, 2007 - Basic Troubleshooting for RPCHTTP Publishing Exchange 2003
Troubleshooting RPC/HTTP is not an easy task. The reason for this is that there are so many moving parts to an RPC/HTTP solution it's often hard to figure out which part is broken. The ISA Firewall's log files are of no help at all, so you have to take a different approach to troubleshooting RPC/HTTP publishing failures
May 16th, 2007 - Help for the ISA Firewall RPC Protocol Challenged
The ISA Firewall's RPC filter is one of the nice differentiators that makes the ISA Firewall most secure and more flexible than just about any other firewall on the market today. However, there are some scenarios where that RPC filter can drive you crazy! For example, have you ever tried to use the Certificates MMC from the ISA Firewall to obtain a Computer Certificate from your online enterprise CA? If so, then you know what I mean
Apr 20th, 2007 - DNS RPC Exploit May Need Immediate Attention by ISA Firewall Administrators
Microsoft recently reported a nasty RPC related DNS exploit that can disable or allow complete control of computers that have Microsoft DNS services running on them. You can see a detailed description of the problem in George Ou's blog at http://blogs.zdnet.com/Ou/?p=472 My first thought about the problem was that its not really a problem for well designed networks that use perimeterization and least privilege

Articles top

Understanding and Implementing ISA 2004 as an Application Firewall with the RPC Stateful Inspection Filter: Date - Feb 19, 2005; Author - Thomas Shinder; Section - Articles; ISA Server 2004 (ISA firewall) includes a number of technologies that provide enhanced security performance for corporate network infrastructures. The unique combination of security and functionality is highlighted by the application filters included with the ISA firewall right out of the box. It is an important fact to realize that the RPC (Remote Procedure Call) protocol is used by many Microsoft networked applications, but that most of IT personnel, including network and firewall administrators, do not understand how the RPC protocols works. They don’t understand what potential problems are generated by the RPC protocol, and most importantly, they don’t know how to protect infrastructure servers. Typical network and firewall administrators just think that RPC is not secure and don’t even consider the fact that RPC access can be made secure, and this article will show you how to secure it.
Enabling Full Outlook Client Access Anywhere using the ISA Firewall’s Secure Exchange RPC Filter: Date - Feb 06, 2005; Author - Thomas Shinder; Section - Articles; There’s no reason why your users ever need to be without their full Outlook MAPI client. When you bring an ISA firewall into your organization and configure Secure Exchange RPC Server Publishing Rules and pair this with an industry standard split DNS infrastructure, your users will realize all the productivity benefits that flow from the "Outlook Just Works" scenario. We use it everyday and so do our customers. Give it a try and you’ll be a believer too! Check out this article for all the details.
Publishing RPC over HTTP by Placing the RPC/HTTP Proxy on the ISA Server 2000 Firewall: Date - Apr 26, 2004; Author - Thomas Shinder; Section - Articles; The new Outlook and Exchange 2003 RPC over HTTP feature is great for users stuck behind restrictive firewalls. But what if you want to put the RPC over HTTP proxy server on the ISA firewall machine itself? No problem! Check out this article for all the step by step procedures.
Joining the Branch Office to the Main Office with ISA 2000 Firewalls: Connecting to the Main Office Exchange Server from the Branch Office using RPC over HTTP: Date - Feb 06, 2004; Author - Thomas Shinder; Section - Articles; The new Outlook and Exchange 2003 RPC over HTTP feature is great for users stuck behind restrictive firewalls. But what if you want to put the RPC over HTTP proxy server on the ISA firewall machine itself? No problem! Check out this article for all the step by step procedures.
Configuring ISA Server 2000 to Support Outlook 2003 RPC over HTTP - Part 2: Forcing SSL on the RPC Directories and Configuring IPSec Security on the Front-end and Back-End Exchange Servers: Date - Dec 30, 2003; Author - Thomas Shinder; Section - Articles; In the first part of this series on configuring ISA Server 2000 firewalls to support Outlook RPC over HTTP client connections we went over how to configure some of the core network infrastructure components to support the RPC over HTTP publishing solution. We also discussed how to install the RPC over HTTP proxy service on the front-end Exchange Server and how to issue a Web site certificate to the RPC over HTTP Web server. We continue the adventure by showing you how to force SSL on the RPC directory, configure the Registry entries on the front-end Exchange Server, and enforce IPSec encryption between the front-end and back-end Exchange Servers.
Designing DNS to Support Remote Outlook MAPI Client Access to Exchange via Secure Exchange RPC Publishing: Date - Oct 01, 2003; Author - Thomas Shinder; Section - Articles; What do you think is ISA Server's "killer app"? If you ask me, its secure Exchange RPC Publishing. Secure RPC Publishing allows you to open Outlook 2000/2002/2003 and have it work when connected to the local network or when you're in a hotel room 3000 miles away. The rub is getting DNS to work right to support this config. No problem! Check out the article and find out how.
Share Your ISA Server/Exchange Experiences - Win a HACKERS DVD: Date - Jul 17, 2003; Author - Thomas Shinder; Section - Articles; Are you using ISA Server 2000 to publish your Exchange Server? Outlook Web Access Web Publishing? Exchange RPC Publishing? SMTP filter and Message Screener? Let Microsoft know and win a free HACKERS DVD in the process

Site News top

Introducing the Beta 1 release of the ISA Server 2000 Exchange 2000/2003 Secure Remote Email Deployment Kit: Date - Oct 07, 2003; Author - Thomas Shinder; Section - Site News; Is your company interested in providing secure remote access to your Exchange Server? Do your remote users need to connect to the Exchange Server's SMTP/POP3/IMAP4/NNTP services? How about secure remote connections to Outlook Web Access? Are you ready to roll out RPC over HTTP connections? If you're considering a secure remote access solution to your Exchange Server, then check out this beta 1 version of the ISA Server 2000 Exchange Server 2000/2003 Deployment Kit. Everything you ever wanted to know but were afraid to ask is included in this kit. Check it out!
Webcast: Publishing Exchange Server using Exchange RPC: Date - Jul 24, 2002; Author - Thomas Shinder; Section - Site News; Come on to the SearchWin2000.com Web site and learn about using Exchange RPC Server Publishing Rules to publish Exchange Servers. You'll see how Exchange RPC might be your best publishing option and how it can make not only your users' lives easier, but your life easier as well!