cert_fingerprint errors on upgrade

sebastian at sspaeth.de sebastian at sspaeth.de
Wed Jun 6 09:55:55 BST 2012

Many of you will experience an "error" like this on upgrading OfflineImap:

    Establishing connection to imap.gmail.com:993
    ERROR: Server SSL fingerprint 'f3043dd689a2e7dddfbef82703a6c65ea9b634c1'
    for hostname 'imap.gmail.com' does not match configured fingerprint.
    Please verify and set 'cert_fingerprint' accordingly if not set yet.

This error is no error, but the new feature of OfflineIMap to actually
perform a check of the SSL certificate of the IMAP server you connect to.
YOu can either set a CA certificate to verify it, or -absent a CA
certificate- you need to store the "fingerprint" of the SSL certificate in
your offlineimap.conf to make sure it does not change on subsequent
connects. If it changes, it will mean that the server has a) a new
certificate or b) there is a malicious man-in-the-middle.

The solution to this problem is easy:

in your repository section, add:


given the above error message.

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