Article ID: 278637 - Last Review: December 3, 2007 - Revision: 7.4

Error message: Your server has unexpectedly terminated the connection

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SYMPTOMS

When you use Microsoft Outlook Express to send and receive mail to a Post Office Protocol 3 (POP3) or Internet Message Access Protocol (IMAP) server running Exchange 2000 Server or Exchange Server 2003, you may receive the following error message:

Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'account name', Server:'server', Protocol: POP3, Port 110, Secure (SSL); No, Error Number: 0x800CCC0F

Additionally, if you try to telnet to the server and access either port 110 (POP3) or 143 (IMAP), when the POP3 or IMAP banner appears, you are disconnected immediately, and you receive the following error message:

Connection to host lost.

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CAUSE

This problem may occur if the Exchange Server administrator has enabled bandwidth throttling in Exchange 2000 Server or in Exchange Server 2003.

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RESOLUTION

To resolve this problem, contact the Exchange Server administrator to see if he or she has to disable bandwidth throttling on the Exchange server. If you are the administrator of the Exchange server, follow these steps to disable bandwidth throttling on an Exchange server:

Click Start, point to Programs, point to Administrative Tools, and then click Internet Services (IIS) Manager.
Right-click the Web sites, and then click Properties.
Click the Performance tab, and then clear the Limit total network bandwidth available for all Web sites on this server option.
Click OK.

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

For more information about how to enable bandwidth throttling, search for the words "bandwidth throttling" in the following Microsoft Help and Support Center Web site:

http://support.microsoft.com/default.aspx. (http://support.microsoft.com/default.aspx)

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MORE INFORMATION

For more information about bandwidth throttling, click the following article number to view the article in the Microsoft Knowledge Base:

238145 (http://support.microsoft.com/kb/238145/ ) How to monitor bandwidth throttling

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REFERENCES

For more information about how to enable and disable bandwidth throttling in Exchange Server 2003, visit the following Microsoft Web site:

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/8af07c87-6dfc-44c6-873a-70f4d8e119aa.mspx?mfr=true (http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/8af07c87-6dfc-44c6-873a-70f4d8e119aa.mspx?mfr=true)

For more information about how to troubleshooting error 0x800CCC0F, click the following article number to view the article in the Microsoft Knowledge Base:

813514 (http://support.microsoft.com/kb/813514/ ) How to troubleshoot error messages that you receive when try to send and receive e-mail in Outlook and in Outlook Express

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