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

Timo Sirainen tss at
Tue Oct 14 22:57:12 UTC 2014

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?

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