Microsoft KB Archive/300506

= ENT2001: Error Message: A Connection Failure Has Occurred =

PSS ID Number: 300506

Article Last Modified on 12/4/2001

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The information in this article applies to:


 * Microsoft Entourage 2001 for Mac

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This article was previously published under Q300506



SUMMARY
When you try to send and receive messages in Entourage 2001, you may be able to send messages, but you may receive the following error message when incoming messages are delivered:

Could not retrieve mail from the account A connection failure has occurred (error 23012).



MORE INFORMATION
Entourage 2001 uses the Authenticated Post Office Protocol (APOP) encrypted method of authentication initially when a session with the Post Office Protocol version 3 (POP3) server is established. This method increases the security for the password guarding against its being intercepted by unauthorized users as clear text over the Internet.

Request For Comment (RFC) 1939 defines the standard for sending encrypted passwords to a POP3 server. According to this standard, there are two possible valid responses. If the server accepts the APOP-encrypted password, known as a challenge, it sends the positive response, usually +OK. If the server is not capable of processing and unencrypting the APOP challenge, it sends a negative response. The most common response is -ERR. At this point, Entourage 2001 sends the password as clear text.

NOTE: The explanatory text following either of the required responses may vary among server software products.

The captioned error message, specifically that the Transmission Control Protocol/Internet Protocol (TCP/IP) session has been terminated, is returned when the server fails to send the appropriate response to the initial APOP challenge.

NOTE: This article assumes that standard troubleshooting has already been done and points to a specific failure that is shown in the client/server trace following this troubleshooting. You need to perform standard troubleshooting procedures first. For additional information about standard troubleshooting, click the article numbers below to view the articles in the Microsoft Knowledge Base:

280760 ENT 2001: End of File Error Message When You Start Entourage

272328 ENT 2001: How to Set up a POP3 E-mail Account in Entourage

Additional query words: Mac Apple crash smtp ENT ENT2001 err msg mail POP send receive connect

Keywords: kbinfo KB300506

Technology: kbEntourage2001 kbEntourage2001Search kbEntourageSearch kbHWMAC kbOSMAC

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