Symptoms:

When you try to send and receive email, you may receive an error message similar to one of the following:

The connection could not be established because the destination computer has actively denied the connection.Server not found. (Account:AccountName, POPServer:'mail', Error Number: 0x800ccc0d)

Task 'ServerName - Send and Receive' reported an error (0x800ccc0f): 'The connection to the server has been broken. If the problem persists, contact the server administrator or Internet Service Provider (ISP). The server replied: ? K'

The server unexpectedly ended the connection. There may be a server problem, a network problem, or it may have been down for a long time. Account. AccountName, Server: 'ServerName', Protocol: POP3, Server Response: '+OK', Port: 110, Secure (SSL): No, Error Number: 0x800ccc0f

Task 'SMTPServerName - Send and Receive' reported an error (0x80042109): 'Outlook cannot connect to the outgoing mail (SMTP) server. If you continue to receive this message, please contact your server administrator or Internet Service Provider (ISP).'

The operation has timed out waiting for a response from the receiving server (POP) 0x8004210a

Communication with server timed out 0x800ccc19

You may also receive an error message that includes one or more of the following error codes:

Cause

These error messages can occur if Microsoft Outlook or Microsoft Outlook Express cannot establish a connection to the email server. These error messages are usually due to one of the following causes:

Solution

The most frequent causes of these error messages are problems with Internet connectivity and incorrectly configured account options in Outlook or Outlook Express. First, check that you are connected to the Internet. For this, follow these steps:

Step 1 – Check that you are connected to the Internet

To check Internet connectivity, follow these steps:

If you continue to experience network connectivity issues when you type one of these addresses in the address bar, see the following article for more information on troubleshooting Internet connectivity:936211(http://support.microsoft.com/kb/936211/) How to fix network connectivity problems in Internet Explorer If you can successfully connect to the Internet, the next step is to check your email account settings in Outlook or Outlook Express.

Step 2 – Check account settings

To verify that your email account information and email server are set up correctly in Outlook or Outlook Express, we recommend that you contact your email service provider (which may also be your Internet Service Provider). ). For information about which values ​​to check, see the following article in the Microsoft Knowledge Base:287532(http://support.microsoft.com/kb/287532/) How to set up Internet email accounts in Outlook

Advanced troubleshooting

If you're still having problems sending and receiving mail after you've verified your email server settings with your email service provider, the following steps provide advanced troubleshooting steps. If you are not comfortable with advanced troubleshooting, you can ask someone for help or contact technical support. For information about how to do this, visit the following Microsoft website:http://support.microsoft.com/gp/assistsupport(http://support.microsoft.com/gp/assistsupport) Perform the following methods in order. If one method doesn't resolve the issue, move on to the next. .

Method 1 – Start Outlook in Safe mode

To start Outlook in safe mode:

Windows Vista

Windows XP, Windows Server 2003, or Windows 2000

When you start Outlook in safe mode, Outlook starts without any extensions, preview pane, or toolbar customizations; this may indicate a corrupted profile or a conflicting third-party application or plugin. See method 2 to create a new email profile. For help identifying a conflicting application or plug-in, you may want to contact technical support.

Method 2 – Create a new email profile

You may be able to resolve these issues by creating a new email profile. For more information about how to create profiles in Outlook, click the following article numbers to view the articles in the Microsoft Knowledge Base:829918(http://support.microsoft.com/kb/829918/) How to create a new email profile in Outlook 2003 and in Outlook 2007287072(http://support.microsoft.com/kb/287072/) OL2002: How to create a new email profile for Outlook195718(http://support.microsoft.com/kb/195718/) OL2000: (CW) How to create a new email profile for Outlook

Method 3 – Delete suspicious messages from your mailbox

If there is a damaged message in your mailbox, you can resolve it by doing one of the following:

Method 4 – Visit your antivirus vendor's website for other tips

If your antivirus solution includes an email scanning feature, you may need to perform additional configuration before you can use Outlook or Outlook Express with it.

Antivirus software known to cause this issue includes products from the following vendors:

For more information on this, visit the following websites:

Symantec:http://www.symantec.com/region/mx/techsupp/(http://www.symantec.com/region/mx/techsupp/)McAfee:http://en.mcafee.com/root/support.asp?cid=9045(http://en.mcafee.com/root/support.asp?cid=9045)Trend Micro:http://esupport.trendmicro.com/support/supportcentral/supportcentral.do?id=m1(http://esupport.trendmicro.com/support/supportcentral/supportcentral.do?id=m1) Panda:http://www.pandasecurity.com/spain/homeusers/support/(http://www.pandasecurity.com/spain/homeusers/support/)

Note: An antivirus program is designed to help protect a computer from viruses. You should not download or open files from sources you do not trust, nor should you visit websites you do not trust or open email attachments when your antivirus program is disabled.

For more information about computer viruses, click the article number below to view the article in the Microsoft Knowledge Base:129972(http://support.microsoft.com/kb/129972/) Viruses: Description, Prevention, and Recovery Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft makes no warranty as to the accuracy of this third-party contact information. The third-party products discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products. .

Method 5: Remove and reinstall Outlook Express

If Outlook Express has been removed from the computer or the Outlook Express installation is damaged, Outlook will not work correctly and might generate one of the error messages that are mentioned in the "Symptoms" section. To resolve this problem, reinstall Outlook Express.

For more information about this, click the following article numbers to view the articles in the Microsoft Knowledge Base:318378(http://support.microsoft.com/kb/318378/) How to reinstall or repair Internet Explorer and Outlook Express in Windows XP For more information that explains why Outlook Express is needed to use Outlook, click the number following article to view in the Microsoft Knowledge Base:230076(http://support.microsoft.com/kb/230076/) OL2000: Why Outlook 2000 Requires Outlook Express

Method 6 – Check that all SMTP email addresses in a distribution list are valid

If an SMTP address in a distribution list is corrupted or malformed, error 0x8004210b may occur. Examine all the addresses in the distribution list to verify that they are correct. In addition, you can send individual test messages to each member of the distribution list to find out what the wrong address is.

Method 7: Examine your firewall software settingsWarning:

this workaround can make a computer or network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this solution, but we provide the information so that you can decide for yourself whether to implement it. Use this solution at your own risk.

Important: These steps may increase your security risk. They can also make your computer or network more vulnerable to attacks by malicious users or by malicious software such as viruses. We recommend following the process outlined in this article to enable the programs to work as designed or to implement certain capabilities of the programs. But before making these changes, we recommend that you assess the risks associated with implementing this process in your particular environment. If you decide to implement this process, take additional steps to help protect your system. We recommend that you use this process only if you really need it.

Configure your firewall software to grant Internet access to the following files:

By default, most email clients should have outgoing access on port 25 and incoming access on port 110. For more information about the ports that communicate with your email server, contact with your ISP or system administrator.

Firewall software known to cause this issue includes products from the following vendors:

McAfee Personal FirewallCheck the configuration options in the McAfee Personal Firewall program and make sure that Microsoft Outlook or Microsoft Outlook Express have full access.

For more information about how to configure McAfee Personal Firewall, visit the following McAfee website:http://www.mcafee.com(http://www.mcafee.com) You can also remove and reinstall the McAfee Personal Firewall program. The reinstallation process recreates the program signature file used by the firewall. Additionally, this process ensures that both Outlook and Outlook Express are included in the list of programs that are allowed to access the Internet.

Norton Personal Firewall (Symantec)If you are running Symantec's Norton Personal Firewall 2002, Norton Internet Security, or Norton SystemWorks software, contact Symantec Technical Support for an update or for instructions on how to reconfigure the product to resolve the problem.

For more information about how to contact Symantec, see the Symantec contact information later in this article.

More informationIf the error code is accompanied by a timeout error message, you may be able to resolve this problem by increasing the server timeout in Outlook or Outlook Express. To increase the server timeout setting, use one of the following methods.

Outlook 2000 (CW)

Outlook 2000 (IMO)

Outlook 2002 and Outlook 2003

Outlook 2007

Outlook Express 5.x and 6.0