BUG: Authentication client sent unknown handshake command

[Timo Sirainen]

You have misconfigured Dovecot's auth sockets. Providing doveconf -n output would help figuring out the problem. Or just delete all the auth-related socket settings from config files and it should work.

On 9.7.2014, at 0.03, Lukas Haase <lukashaase at gmx.at> wrote:

> May I gently "push" this?
> The string "BUG: Authentication client sent unknown handshake command"
> comes from dovecot (presumably it's in the source code) so I think it
> shouldn't be too mysterious what's happening here.
> 
> Thank you,
> Luke
> 
> On 2014-07-03 19:10, Lukas Haase wrote:
>> Hi,
>> 
>> Some time ago my dovecot started to become BUGgy: Evertime I restart the
>> system, dovecot is started but I cannot login. I see the following
>> information in the logs:
>> 
>> Jul  4 04:04:36 mail dovecot: auth:
>> passwd-file(user,127.11.91.218,<nfkQjFT9vwCADFra>): no passwd file:
>> /etc/dovecot/imap.passwd
>> Jul  4 04:04:36 mail dovecot: auth: Error: BUG: Authentication client
>> sent unknown handshake command:
>> REQUEST?1183186945?20438?1?a8c7241e7b0778f9f0125da760cd16fa
>> Jul  4 04:04:36 mail dovecot: imap: Error: Authentication server didn't
>> send valid SPID as expected: MECH#011PLAIN#011plaintext
>> Jul  4 04:04:36 mail dovecot: imap: Error: Disconnected from auth
>> server, aborting (client-pid=20438 client-id=1)
>> Jul  4 04:04:36 mail dovecot: imap-login: Internal login failure
>> (pid=20438 id=1) (internal failure, 1 succesful auths): user=<user>,
>> method=PLAIN, rip=127.11.91.218, lip=73.82.101.172, mpid=20439, TLS,
>> session=<nfkQjFT9vwCADFra>
>> 
>> It does not help to restart the client. But when I then restart the server
>>  service dovecot restart
>> it works again.
>> 
>> But this is very dangerous because the server might reboot and I might
>> not immideately have the chance to restart dovecot manually.
>> 
>> What's going on here?
>> 
>> mail:/# uname -a
>> Linux mail 2.6.32-openvz-042stab090.2-amd64 #1 SMP Sat Jun 21 00:22:42
>> MSK 2014 i686 GNU/Linux
>> mail:/# dovecot --version
>> 2.1.7
>> 
>> Thanks,
>> Luke
>>