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Are you actually trying to access a telnet server on port 23, or are you trying to access the SMTP server on port 25?
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Are you actually trying to access a telnet server on port 23, or are you trying to access the SMTP server on port 25?

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All:<br />
Had a consultant install and configure Exchange 2007 internally for my network. Everything seems in place, but am not able to 'end map' it. It won't accept a telnet request from outside the network over the cloud. <br />
Here's the setup:<br />
CLOUD...&gt;ROUTER...&gt;FIREWAL<wbr />L...LAN...<wbr />SERVER<br />
1. Had my ISP create a static/NATTED address on the router. They also opened all ports. <br />
2. Created a policy in firewall to allow all traffic from WAN to LAN on this IP address, including all services. <br />
NAT is run on router. I am able to ping this server from across the cloud, but no telnet traffic at all. <br />
Server is Windows 2003 running Exchange 2007. <br />
I'm fresh out of ideas. <br />
<br />
Me
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All:
Had a consultant install and configure Exchange 2007 internally for my network. Everything seems in place, but am not able to 'end map' it. It won't accept a telnet request from outside the network over the cloud. 
Here's the setup:
CLOUD...>ROUTER...>FIREWALL...LAN...SERVER
1. Had my ISP create a static/NATTED address on the router. They also opened all ports. 
2. Created a policy in firewall to allow all traffic from WAN to LAN on this IP address, including all services. 
NAT is run on router. I am able to ping this server from across the cloud, but no telnet traffic at all. 
Server is Windows 2003 running Exchange 2007. 
I'm fresh out of ideas. 

Me

Can't Telnet new Exchange 2007 Installation

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.