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Exchange and OWA

Posted on 2004-10-18
Medium Priority
Last Modified: 2008-01-09
I am running Exchange 2000 on an Windows 2003 environment.  I am also running our own Website from the same location.  I have a 3 Meg internet circuit for both outgoing and incoming traffic.  I am having no problems accessing the OWA from internal, I would like to start using for external use.  I have all internet traffic run through a Sonicwall Pro 3060 and is sitting on my DMZ.  How do I set it up so that when I try to access my OWA from external, it actually gets routed to the Exchange server?

Question by:dwaynem2345
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LVL 11

Expert Comment

ID: 12341057
How many IP addresses do you have (public)?  If you have multiple, then just assign a different IP address to mail.mycompany.com than www.mycompany.com..  According to the website, "SonicOS Enhanced activates three additional user-assigned ports on the PRO 3060 that can be configured either as additional LANs, WANs or DMZs, or as a Hardware Fail-over port, offering greater network configuration flexibility."

If you only have one public IP address, the easiest way to do this is probably to merge your website to Exchange's IIS's web root directory.  So, for example, if you type www.mycompany.com you'll get to your website, but if you type "www.mycompan.com/exchange", it'd get to your OWA site.

Finally, another trick to do this with one IP is to assign a different port to your OWA, for example, port 8888, and open up port forwarding for port 8888 to Exchange server's IIS.  Then, in your actual IIS server for your company, you can setup a forward rule to forward anything going to mail.mycompany.com to forward to http://mail.mycompany.com:8888/exchange..

I've done all three in the past.  The best way to do it is to have multiple IP's, of course.  However, when you're stuck with single IP, you should still be able to do either one, which I've done myself at one time or another....

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Author Comment

ID: 12341149
I would like to use the latter, how do I port forward from my webserver???
LVL 11

Expert Comment

ID: 12341312
The simplest way to do it is to create a virtual directory under your existing website called "OWA", for example, and point to any random directory for starters.  Then, once created, go to properties of "OWA", and change it to point to "http://mail.mycompan.com:8888/exchange" (assuming that you are forwarding to port 8888).  Make sure you have firewall port 8888 open and forwarding to your Exchange server, and you are done.  Just type mail.mycompany.com/owa and it will automatically forward you to "http://mail.mycompany.com:8888/exchange"

A more complicated way to do it is to create seperate websites on IIS, one for www.mycompany.com (existing), and one for owa.mycompany.com:

1.  In your current website, make sure you assing host header to the website.  For example, if the website is called www.mycompany.com, you need to go in to IIS, go to properties (of the website), under the website tab, click on "Advanced" tab, and assign www.mycompany.com and port 80.  Continue to add additional host headers (such as servername.com, mycompany.com, etc.)

2.  You can then create a new website, and assign the proper Host header for it.  For example, identify this site as "mail.mycompany.com" or "OWA.mycompany.com".  Follow the step as described above to forward the request to http://mail.mycompany.com:8888/exchange

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Author Comment

ID: 12341815
I get it to work, kind of, when I type it from Internet Explorer, I get this error

Please try the following:

If you typed the page address in the Address bar, make sure that it is spelled correctly.

Open the mail.centrexlabs.com:85 home page, and then look for links to the information you want.
Click the Back button to try another link.

but when I click on the mail.centrexlabs.com:85, it goes right in. Is there something that I am missing??
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Accepted Solution

infotrader earned 800 total points
ID: 12342000
It is working just fine, I think

I typed http://mail.centrexlabs.com/owa and it forwarded me directly to http://mail.centrexlabs.com:85/exchange ..  Of course I couldn't proceed further since I do not have an user account, but it IS working.

The only thing I can think of is that perhaps you are trying to access the site from INSIDE your firewall.  There are some issues with trying to access the WAN interface IP of the router from the LAN interface.. the routing table gets all messed up.

Also, when you are trying to access it from internal, mail.centrexlabs.com could be pointing to your IIS server.  Because you are relying on your router to port forward the port to another computer, this particular transaction might never work.

The easiest work-around to that is to call your website www, and your Exchange mail.  Create a LOCAL version of DNS for those two servers (or you can also use HOSTS files to do this).  use www.centrexlabs.com/owa to access your email (which will point to mail.centrexlabs.com:85/exchange... This will work because mail and www are now two different servers with different IP address....  (Or... just tell your users NOT to use OWA when they are insdie the company, or type mail.centrexlabs.com:85/exchange when they are inside :-) )

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