Proxy problem: "[COMPRESSIONACTIVE] TLS compression already enabled"

Marc Schiffbauer m at
Tue Oct 14 23:10:23 UTC 2014

* Timo Sirainen schrieb am 15.10.14 um 00:57 Uhr:
>On 14 Oct 2014, at 15:24, Ralf Hildebrandt <r at> wrote:
>> We're proxying using 2.2.14~rc1 (on our IMAP Proxy) to two dovecot
>> backend servers running dovecot-2.2.13-r1
>> When we're using Thundebird to connect to the dovecot proxy, we're
>> getting the message "The mail server for account ACCOUNTNAME
>> responded: [COMPRESSIONACTIVE] TLS compression already enabled"
>> But why?
>Is the connection from proxy to backend using SSL? Did this work in earlier Dovecot version?

I talked to Ralf about this issue today. Yes, proxy to backend is 
using ssl. And yes when proxy is talking to a 2.1.17 backend there 
is no issue.


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