Error decompressing data

[Stephan]

Am 04.07.2012 09:03, schrieb Bron Gondwana:
>
>
> On Mon, Jul 2, 2012, at 03:26 PM, steffo76 at gmx.de wrote:
>> Hi list,
>>
>> I am having trouble with Apple Mail on iPhone and cyrus imapd. In telemetry logging I see the following:
>>
>> 3 OK Completed^M
>> <1341234999<4 COMPRESS DEFLATE^M
>>> 1341234999>4 OK DEFLATE active^M
>>> 1341235140>* BYE Error decompressing data^M
>>
>> In my maillog I can see the following
>>
>> Jul  2 15:24:06 server imap[32304]: zlib inflate error: -3 invalid distance too far back
>>
>> This is cyrus imapd 2.4.12. Any hints how to resolve this ?
>
> Workaround:
>
> suppress_capabilities: COMPRESS=DEFLATE
>
> Is this every time, or just sometimes?  It looks like there's a bug in the zlib
> usage somewhere along the line.
>
> Bron ( or a bogus virus scanner fiddling the data stream )

It was actually caused by the used imap proxy. After switching to 
another one it started working again.

Thanks
Stephan