The fingerprint for the connection to imap.gmail.com:993 has changed

[Denis Bitouzé]

Hi,

I'm using imap.gmail.com as imap server and, since today, gnus tells me:

  ┌────
  │ Certificate information
  │ Issued by:          Google Internet Authority G2
  │ Issued to:          Google Inc
  │ Hostname:           imap.gmail.com
  │ Public key:         RSA, signature: RSA-SHA256
  │ Protocol:           TLS1.2, key: ECDHE-RSA, cipher: AES-128-GCM, mac: AEAD
  │ Security level:     Legacy
  │ Valid:              From 2016-09-29 to 2016-12-22
  │ 
  │ 
  │ The fingerprint for the connection to imap.gmail.com:993 has changed from
  │ sha1:b7:58:ef:a0:55:ca:f4:ee:61:62:52:b2:89:43:6a:89:bc:51:1c:bc to
  │ sha1:9c:f5:5a:12:dd:a4:a1:13:42:96:40:9f:dc:59:5a:c9:2c:f4:2c:33
  └────

and I'm not able to connect to it:

  ┌────
  │ Warning: Opening nnimap server on gmail...failed: ; Unable to open
  │ server nnimap+gmail due to: Buffer  *nnimap imap.gmail.com 993  *nntpd**
  │ has no process 
  └────

What am I supposed to do? (I didn't find anything useful on Internet.)

Thanks!
-- 
Denis