Setting Up Outlook 2013 to an exchange account remotely

We changed exchange servers in Jan, and ever since then I've done been able to set up new employee outlook's remotely.

If I set up a new computer while on the network it configures itself and works perfectly.  HTTP over RPC is set up, and functions fine once outlook is set up but I cannot get the initial set up to work.

How I did it before, I would use GoToAssist and connect to the remote computer, set up a VPN back to our office, so that the computer is on our network over that connection then I go through the OUtlook set up process and it would work.

Now it says can't find server, if I type in our exchange server address he still says can't find server.

How do I set up a Outlook on a computer outside of the network?  It doesn't happen often but we have a few remote employee's, the one that isn't working currently is windows 8.1, and outlook 2013.

Thanks
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FosterThomasAsked:
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Joshua GrantomSenior Systems AdministratorCommented:
Why dont you use the public IP address for your Exchange Server instead of trying to VPN?
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FosterThomasAuthor Commented:
I tried that as well, you are talking about using the public IP in spot of the server when setting it up?

Yes I have tried that.
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Joshua GrantomSenior Systems AdministratorCommented:
can you ping the IP address? Can you access Outlook Web Access? We need a little more information to be able to help you troubleshoot.

What it sounds like to me is that when the exchange server was changed, The NAT or forwarding was not changed between the public IP address and internal.

Does the new exchange have the same IP as the old exchange server?
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FosterThomasAuthor Commented:
OWA can be reached just fine and yes I can ping the address.   The exchange IP did change but as worked plenty of times since then, it seems to be either a windows 8.1 or outlook 2013 issue not exchange, as it worked before on a win 7 machine with outlook 2010 a few times.
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Joshua GrantomSenior Systems AdministratorCommented:
have you disabled the firewall on the Windows 8.1 machine?
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FosterThomasAuthor Commented:
Yes firewall was disabled

For IP address in the server field do I put http:// or just simply the IP, though that doesn't matter cause I've tried it both ways.   I just ran into a windows 7 machine that it won't work on either, it worked perfectly before.

I would connect to VPN, and it would register the computer so it recognized it and automatically set up Outlook based on username and password.

Now no matter what I put for server even if I go in and put the RPC server and restart outlook it won't connect.   Yet all other laptops previously set up have the same information and work perfectly.
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Joshua GrantomSenior Systems AdministratorCommented:
Is the RPC service running on the exchange server?
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FosterThomasAuthor Commented:
Yes, and all laptops that are set with RPC are working perfectly, while remote it just seems to be an issue of setting up a new server
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FosterThomasAuthor Commented:
didn't mean new server, meant a new outlook on a new computer
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