Error: o_stream_send_istream and Disconnected in APPEND

[Alessio Cecchi]

Hi,

with a Python script I have found that all users that have this errors 
are using Thunderbird:

# ./check.py /var/log/dovecot/dovecot.log
<p4YB0WKNUcNf8zAf> ==> name=Thunderbird, version=60.7.2
<kVE0RGKN/8Jf8zAf> ==> name=Thunderbird, version=60.7.2
<oFUykWONFctdPUnr> ==> name=Thunderbird, version=60.7.2
<dUyUlmONVMUCLHgk> ==> name=Thunderbird, version=60.7.2
<dfaphWONS8UCLHgk> ==> name=Thunderbird, version=60.7.2
<qV/6jWSN2s9PHpgH> ==> name=Thunderbird, version=60.8.0
<QLeWB0+NuvBTlali> ==> name=Thunderbird, version=60.7.2
<RQFSxE+NyXdQEudp> ==> name=Thunderbird, version=60.7.2
<MFXR2U+N17NQEudp> ==> name=Thunderbird, version=60.7.2
<8WsIY1CN5uoCLHgk> ==> name=Thunderbird, version=60.7.2
<x6uQxU+NgeMCLHgk> ==> name=Thunderbird, version=60.7.2
<4ezjaFCNfJVQEudp> ==> name=Thunderbird, version=60.7.2

So seem a problem with only Thunderbird, but why? And can be mitigated 
by us?

Thanks

Il 11/07/19 09:13, Alessio Cecchi via dovecot ha scritto:
>
> Hi,
>
> I'm running some Dovecot servers configured with LVS + Director + 
> Backend + NFS and version 2.2.36.3 (a7d78f5a2).
>
> In the last days I see an increased number of these error:
>
> Error: 
> o_stream_send_istream(/nfs/mail/company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01) 
> failed: Broken pipe
>
> always with action "Disconnected in APPEND", when users try to upload 
> a message in Sent or Drafts.
>
> Here the logs:
>
>
> Director:
> Jul 10 14:53:06 imap-login: Info: proxy(info at company.com): started 
> proxying to 10.0.0.20:143: user=<info at company.com>, method=PLAIN, 
> rip=84.1.2.3, lip=195.1.2.3, lport=993, TLS, session=<eA6XKFONwP1f5Sh4>
> Jul 10 15:09:56 imap-login: Info: proxy(info at company.com): 
> disconnecting 84.1.2.3 (Disconnected by client: EOF(0s idle, 
> in=648413, out=6602)): user=<info at company.com>, method=PLAIN, 
> rip=84.1.2.3, lip=195.1.2.3, lport=993, TLS, session=<eA6XKFONwP1f5Sh4>
>
> Backend:
> Jul 10 14:53:06 pop01 dovecot: imap-login: ID sent: 
> x-session-id=eA6XKFONwP1f5Sh4, x-originating-ip=84.1.2.3, 
> x-originating-port=64960, x-connected-ip=195.1.2.3, 
> x-connected-port=993, x-proxy-ttl=4: user=<>, rip=84.1.2.3, 
> lip=195.1.2.3, secured, session=<eA6XKFONwP1f5Sh4>
> Jul 10 14:53:06 pop01 dovecot: imap-login: Login: 
> user=<info at company.com>, method=PLAIN, rip=84.1.2.3, lip=195.1.2.3, 
> mpid=9151, secured, session=<eA6XKFONwP1f5Sh4>
> Jul 10 14:53:07 pop01 dovecot: imap(info at company.com) 
> session=<eA6XKFONwP1f5Sh4>: ID sent: name=Thunderbird, version=60.7.2
> Jul 10 15:09:56 pop01 dovecot: imap(info at company.com) 
> session=<eA6XKFONwP1f5Sh4>: Error: 
> o_stream_send_istream(/nfs/mail/company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01) 
> failed: Broken pipe
> Jul 10 15:09:57 pop01 dovecot: imap(info at company.com) 
> session=<eA6XKFONwP1f5Sh4>: Disconnected in APPEND (1 msgs, 48 secs, 
> 0/2657336 bytes) in=886661 out=26654 del=1 expu=0 trash=0
>
> I can't understand if is a network problem (Firewall? Load Balancer? 
> Switch?) or a users LAN problem. Or others.
>
> When this happen user see an error message like "Unable to save email 
> in Sent folder".
>
> Any suggestions?
>
> Thanks
>
> -- 
> Alessio Cecchi
> Postmaster @http://www.qboxmail.it
> https://www.linkedin.com/in/alessice

-- 
Alessio Cecchi
Postmaster @ http://www.qboxmail.it
https://www.linkedin.com/in/alessice

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