I suspect the problem is that dovecot tries to report LDAP error over
GSSAPI. So the best fix is to make sure your LDAP server does not return
error. =)

Aki

On 15.8.2019 14.56, Eugene Bright wrote:
> That's right.
> GSS-API is not used anywhere else.
> Do you like to inspect my full configuration?
> I can dump connection session and send pcap file here.
>
> On August 15, 2019 7:27:20 AM GMT+03:00, Aki Tuomi
> <aki.tu...@open-xchange.com> wrote:
>
>         On 15/08/2019 00:34 Eugene via dovecot <dovecot@dovecot.org>
>         wrote: The next combination of parameters makes 100% LDAP
>         connections unsuccessful (the log snippet form the previous
>         mail). sasl_bind = yes sasl_mech = gssapi tls = yes Looks like
>         this combination is utterly incorrect and should be prohibited
>         (tls must not be used when mech is gssapi).
>         
> https://lists.fedorahosted.org/archives/list/sssd-us...@lists.fedorahosted.org/message/G7S2TOFDCM62ZUHIBWYVZIEVYXO3KYAI/
>         With `tls = no` errors `encoded packet size too big` becomes
>         sporadic, but still heart auth orepations performance. May be
>         there are two different problems. 
>
>
>     Does the "encoded packet size too big" coincide with LDAP server 
> connection failure?
>
>     Aki
>
>         Has someone encountered this problem before? How can I help to
>         facilitate the issue debugging? [I] net-mail/dovecot Installed
>         versions: 2.3.7.1(01:58:12 08/14/19)(bzip2 caps ipv6 kerberos
>         ldap libressl lua lz4 lzma pam postgres sieve sqlite tcpd zlib
>         -argon2 -doc -lucene -managesieve -mysql -selinux -solr
>         -static-libs -suid -textcat -vpopmail) On 8/15/19 12:01 AM,
>         Eugene wrote:
>
>             Hello! Dovecot uses it's own SASL implementation, doesn't
>             it? Aug 14 23:45:23 example.com auth[10428]: GSSAPI client
>             step 1 Aug 14 23:45:23 example.com auth[10428]: encoded
>             packet size too big (813804546 > 65536) Aug 14 23:45:23
>             example.com dovecot[10085]: auth-worker(10428): Error:
>             LDAP: Can't connect to server: ldap://ipa2.example.com Aug
>             14 23:45:23 example.com dovecot[10085]: auth: Error: auth
>             worker: Aborted USER request for eugene: Lookup timed out
>             Aug 14 23:45:23 example.com dovecot[10085]: imap: Error:
>             auth-master: login: request [3847225345]: Login auth
>             request failed: Internal auth failure (auth connected
>             60000 msecs ago, request took 60000 msecs,
>             client-pid=10362 client-id=1) Looks like cyrus-sasl
>             encountered same problem earlier.
>             
> https://lists.andrew.cmu.edu/pipermail/cyrus-sasl/2017-March/003001.html
>             I never have such an issue with ldapsearch. So, I assume
>             there is a similar problem in Dovecot SASL implementation. 
>
>         -- Eugene Bright IT engineer Tel: + 79257289622 
>
> ------------------------------------------------------------------------
> Eugene Bright
> IT-engineer
> Tel.: +7 925 728 96 22

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