Fix Error Your Server has Unexpectedly Terminated the Connection

Error messages can be annoying and they grind work to a halt. While using Microsoft Outlook Express to send or receive emails to IMAP or POP3 server running Exchange 2000 or Exchange 2003 server, you might receive this error message: Your server has unexpectedly terminated the connection.

What could be the reason behind this error message?

This error message occurs when the Exchange Server administrator has enabled bandwidth throttling in Exchange Server 2003 or 2000. Few other causes are also responsible for this server error message. If there is no internet connection, when the Firewall on the Wi-Fi connection is blocking you, if the background programs are using the bandwidth, etc.

So how to fix the error: ‘Your server has unexpectedly terminated the connection’?

If you are the administrator of the Exchange server, then you can follow the steps below to disable bandwidth throttling on Exchange server:

  1. Go to Start, then Programs, and Administrative Tools, now click on Internet Services (IIS) Manager
  2. Right-click the websites, and select Properties
  3. Next, click on the Performance tab, and clear the Limit total network bandwidth available for all Web sites on this server option
  4. Finally, hit on OK

IMAP and POP3 capabilities will not be affected when you enable bandwidth throttling on each website. The Enable Bandwidth Throttling option will be located on the Performance tab of each Web site.

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John Harris

Senior Editor, Content Analyst and a fan of exceptional customer service. John develops and publishes instructional and informational content regarding partition management, Windows hot-fixes, data management and computer troubleshooting.

As a tenured data recovery specialist, John shares exceptional insights and blog posts about data loss and data recovery across any storage device. With 8+ years’ experience in writing for Data Recovery for both Mac OS and Windows OS computers, he is an avid learner who always wants to polish and simplify the data recovery process. John passes his free time playing Chess and reading Science Fiction novels.

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