Is it possible to change the OWA port in Exchange 2013

I have a client who hosts a web server which of course uses port 443.

They also have an Exchange 2013 server and I would like to be able to get them set up to check their email offsite but would need to change the port so that the request directs to the Exchange Server instead of the email server.

I understand that the simplest way to do this would be for them to get a second IP and use 1to1 NAT to direct the traffic, however they use a mickey mouse ISP and I would prefer to avoid having to argue with them if I can help it.

As things are right now no one is accessing their email offsite at all, so my goal is to allow them to use OWA if they would like and if they decide that they want access on their phones etc we can look at getting them a second IP if necessary.

Any help with this would be great.
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Tyler BrooksNetwork and Security ConsultantAsked:
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I don't know if it'd be the simplest way, necessarily, but having them get an additional IP would certainly be the best way.  If you need to have more than a single static IP address, most ISPs will give you a range of 8 address with 5 usable.  That's just the next step up in subnetting.  But that's a bit off-topic since that's not what you asked.  

You should be able to configure your firewall to listen on a different outside port, say 444, and redirect traffic to the Exchange 2013 Server.  This way, you wouldn't change the port that OWA is using on the Exchange Server (still 443) but you'd be able to have users test OWA using a URL like so:

Basically, the firewall detects incoming traffic on port 444 and simply redirects it to the IP address of the Exchange Server on port 443.  

Almost all firewalls allow for this.  In fact, it's usually easier to accomplish on the lower-end, consumer-grade firewalls like Linksys or Netgear.  

You should be able to google around and find out how to do it for your router, but if you need more help, post back here and I can probably hack my way through it.

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Will SzymkowskiSenior Solution ArchitectCommented:
For OWA specifically you can change the port, but if you want to use ActiveSync externally you can only use port 443. So keep that in mind.

Tyler BrooksNetwork and Security ConsultantAuthor Commented:
Thanks for your help guys, I will be trying to implement this over the next 2-3 days and will update/close the questions when finished.
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