Hi everybody,

I'm using dovecot-2.2.11 on NetBSD.

After a kernel upgrade, while using the same dovecot binaries (they were 
working perfectly until today), I'm experiencing this error (more log at the 
end of my email):

BUG: Authentication client sent unknown handshake command: 
REQUEST?227672066?18807?2?c717631d60216b2e9ec57a2fa69674b8?session_pid=16343?...

I tried to build a newer version of dovecot (2.2.12) but same issue.

I know this should come from my system and not dovecot, but how can I debug 
this kind of problem ? I already enabled various debug (auth_verbose, 
auth_debug, mail_debug) but I need more information.

This issue have already been discussed on dovecot mailing list without solution 
:-)

Thank you very much.


Best,
jym

Log:

Apr 16 16:29:16 dodo dovecot: imap-login: Debug: SSL: where=0x2002, ret=1: SSL 
negotiation finished successfully [::1]
Apr 16 16:29:17 dodo dovecot: auth: Debug: client in: AUTH      2       PLAIN   
service=imap    secured session=cE/PvSn3qgAAAAAAAAAAAAAAAAAAAAAB        lip=::1 
rip=::1 lport=993       rport=65450     resp=<hidden>
Apr 16 16:29:17 dodo dovecot: auth: Debug: 
cache(mylo...@myhost.org,::1,<cE/PvSn3qgAAAAAAAAAAAAAAAAAAAAAB>): hit: <hidden>
Apr 16 16:29:17 dodo dovecot: auth: Debug: client passdb out: OK        2       
user=mylo...@myhost.org
Apr 16 16:29:17 dodo dovecot: auth: Error: BUG: Authentication client sent 
unknown handshake command: 
REQUEST?227672066?18807?2?c717631d60216b2e9ec57a2fa69674b8?session_pid=16343?...
Apr 16 16:29:17 dodo dovecot: imap: Error: Authentication server didn't send 
valid SPID as expected: MECH       PLAIN   plaintext
Apr 16 16:29:17 dodo dovecot: imap: Error: Disconnected from auth server, 
aborting (client-pid=18807 client-id=2)
Apr 16 16:29:17 dodo dovecot: imap-login: Internal login failure (pid=18807 
id=2) (internal failure, 1 successful auths): user=<mylo...@myhost.org>, 
method=PLAIN, rip=::1, lip=::1, mpid=16343, TLS, 
session=<cE/PvSn3qgAAAAAAAAAAAAAAAAAAAAAB>
Apr 16 16:29:17 dodo dovecot: imap-login: Debug: SSL alert: close notify [::1]

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