authenticate to backend server: bad protocol

[Laurent G]

Hello,

On a production murder, on Debian Sarge and Cyrus IMAP 2.2.8, I met the
following error :

Dec  4 14:45:21 fe01 imaps[23782]: couldn't authenticate to backend server:
bad protocol / cancel

It fell on all frontends at the same time, and occurred probably for most
new connected clients.
At the same time, other users could still connect to backends :
Dec  4 14:45:01 be02 imap[20306]: login: fe04 [00] catherine.cr DIGEST-MD5
User logged in

Any idea of what can cause such an error ?

Thanks for your help.

-- 
Best regards,
-----
Laurent
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