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Microsoft Exchange: The remote server did not respond to a connection attempt.

A customer had informed me that all outbound email was no longer being received.  I first checked to see if Microsoft Outlook was Online as opposed to Offline.  I then tested internet service by browsing the internet which displayed nothing unusual.  I then opened the Microsoft Exchange Server - System Manager, the Server Queue displayed a number of messages with the error: The remote server did not respond to a connection attempt.  Enabling and reviewing the Default SMTP Virtual Server log file (C:\WINDOWS\System32\LogFiles\SMTPSVC1) and then sending test email messages from the command line, displayed nothing unusual.  Reviewing the Relay Block List also displayed nothing unusual.  My next step was to call the Internet Service Provider.

Qwest/Century Link informed me today that each time they receive a service order from a customer, their system can automatically place a Port 25 Block on Internet Service - even when the service order does not involve internet service.  Microsoft Exchange Server requires Port 25 in order to send outbound email.  I asked Century Link if they can unblock accounts permanently.  According to tech support, it is built into the Century Link system and cannot be modified.  One would think this policy would only apply to residential customers but it applies to both business and residential customers of Qwest/Century Link.

Following are the steps to remove the Port 25 Block:

1.  Call Century Link Tech Support for Internet Service at (800) 247-7285.

2.  Provide them with your company name, primary contact name, address and primary phone number.

3.  Request that the Port 25 Block be removed.

4.  When prompted by the technician, unplug the Qwest/Century Link Router.

5.  Plug the Qwest/Century Link Router back in.

Once the Port 25 Block has been removed and internet service has been restored, Microsoft Exchange Server immediately returns to working properly.  All Queued outbound email that was previously not being sent is now sent.

If this issue did not address your specific problem, troubleshooting methods in addition to a Port 25 Block can be found here.
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