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&quot; I then started the local SMTP server and I could not telnet the localhost on port 25&quot;<br />
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It means that the issue is on your web server and not on exchange server as you were able to telnet exchangeserver from your desktop as well.<br />
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On your webserver did you try to restart the server?<br />
Did you check all DNS settings and default gateways?<br />
If you do a NSLOOKUP from your webserver to your exchange server, does it shows proper records?
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I have a web server with pages that email forms. &nbsp;I used SMTP to connect to our Exchange server. &nbsp;This recently stopped working. &nbsp;On further investigation I found that the web server cannot telnet the exchange server on port 25, I then started the local SMTP server and I could not telnet the localhost on port 25. &nbsp;I can ping sucessfully.<br />
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From my own desktop I can telnet the email server on port 25. &nbsp;I have disabled all antivirus software and firewalls.<br />
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The exchange server is running on Windows Server 2003. &nbsp;The webserver is Windows 2000 Server SP4 running IIS.<br />

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I have a web server with pages that email forms.  I used SMTP to connect to our Exchange server.  This recently stopped working.  On further investigation I found that the web server cannot telnet the exchange server on port 25, I then started the local SMTP server and I could not telnet the localhost on port 25.  I can ping sucessfully.

From my own desktop I can telnet the email server on port 25.  I have disabled all antivirus software and firewalls.

The exchange server is running on Windows Server 2003.  The webserver is Windows 2000 Server SP4 running IIS.


&quot; I then started the local SMTP server and I could not telnet the localhost on port 25&quot;

It means that the issue is on your web server and not on exchange server as you were able to telnet exchangeserver from your desktop as well.

On your webserver did you try to restart the server?
Did you check all DNS settings and default gateways?
If you do a NSLOOKUP from your webserver to your exchange server, does it shows proper records?

cannot telnet port 25 from webserver

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

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).