When you are attempting to connect to an Exchange 2000 Server by using Post Office Protocol 3 (POP3), you may be prompted several times for logon credentials, and you may not be able to log on to Exchange Server successfully. In addition, the following occurs:

•	The POP3 service does not start.
•	If you connect to port 110 by using Telnet, the following information is displayed (which is not the Exchange 2000 POP3 banner): 18:33:22 POP3: 18:33:23 [rx] +OK POP3 server ready POP3: 18:33:23 [tx]
•	New e-mail messages are not being downloaded from your POP3 server.
•	Your default e-mail account settings in Microsoft Outlook have changed. An address of 127.0.0.1 is now displayed as the address for the incoming (POP3) mail server.
•	The following information is recorded in the Event log: Event ID: 1036 Source: POP3SVC Type: Warning An error occurred while starting the Microsoft Exchange POP3 Service: server instance number 1 failed to start with error 0x2740 Event ID: 115 Source: POP3SVC Type: Error The service could not bind instance1. The data is the error code. For additional information specific to the message please visit the Microsoft Online Support.
•	When you connect by using Telnet to port 110, your connection is refused (instead of failing as expected).
•	If you run the netstat -an command on the Exchange server, nothing is shown on port 110 or 25, with the exception of a loopback address of 127.0.0.1.
•	A Dr. Watson error may also occur in the Poproxy.exe program when you restart the Exchange server.

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This issue may occur if you have Norton Antivirus 2000 (or 2001) installed on the computer and the Norton Email Protection application process, Poproxy.exe, is running. This should not be running on an Exchange server as it is a client component.

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Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

Note An antivirus program is designed to help protect your computer from viruses. You must not download or open files from sources that you do not trust, visit Web sites that you do not trust, or open e-mail attachments when your antivirus program is disabled. For additional information about computer viruses, click the following article number to view the article in the Microsoft Knowledge Base: To work around this issue, uninstall Poproxy.exe, which is part of Norton Antivirus 2000. Disabling Norton Antivirus does not resolve this issue, you have to uninstall the program.

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The Norton Antivirus 2000 e-mail protection feature sets up a proxy server on your computer that acts as an additional buffer between the computer and the mail server. It is the proxy server that connects to your POP3 mail server, and not the Outlook client directly.

For more information about Norton Antivirus and how it operates with Outlook, refer to the following Symantec Web pages: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

To display the ports that are in use on the Exchange server, use the Netstat.exe utility:

1.	At a command prompt, run the netstat -an command.
2.	In the Local Address column, look for an IP address and port combination that ends with the port in question.
3.	For example, if you receive errors that indicate that the information store is unable to register the POP3 port (110), run netstat -an with the information store service stopped and look in the Local Address column for a line that ends in ":110". This would indicate that port 110 is in use.

The third-party products that are 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.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

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