[HOWTO] Outlook Error Message “A secure connection to the server cannot be established.”

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I keep on receiving the following message “ERROR: ‘A secure connection to the server cannot be established.'” when trying to connect my Outlook 2007 to my mail server. I pulled my hair out thinking that Windows Vista/Microsoft Outlook certificate and trust setting is the problem. I stumbled onto a solution that finally solved it. The problem is my Courier IMAP server.

As it turns out, Outlook doesn’t support SSLv3. I had been using Thunderbird for the longest time without any problem, but since I had to test Outlook 2007 for business purposes.

To fix the issue, I changed my Courier IMAP setting from:
TLS_PROTOCOL=SSL3
to
TLS_PROTOCOL=SSL23

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One Response to “[HOWTO] Outlook Error Message “A secure connection to the server cannot be established.””

  1. HOWTO: Outlook Error Message “A secure connection to the server cannot be established.” | i-phone.net.in Says:
    September 30th, 2010 at 7:56 am

    […] Life in 0 and 1 iPhone   cannot, connection, Error, established.”, HOWTO, Message, Outlook, secure, […]

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