dovecot - Aug 2012 - pop3 migration

Hi,
I have problems with pop3 migration, the server disconect the dovesync when
fetching mails after 5 minutes with this error in server log:

xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6548
xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 47522 octets
xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6549
xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 355289 octets
xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6550
xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 9638 octets
xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6551
xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 2188 octets
xx.xx.xx.xx   [28F4] 11:59:05 >>> -ERR Command unrecognized:
""
xx.xx.xx.xx   [28F4] 11:59:05 *** <info at istan.cz> 6551 477693894
00:12:55 ERROR
xx.xx.xx.xx   [28F4] 11:59:05 Disconnected

and this in dovecot log:

dsync(info at istan.cz): Debug: imapc(mail.stable.cz:143): Authenticated
successfully
dsync(info at istan.cz): Debug: pop3c(mail.stable.cz): Looking up IP address
dsync(info at istan.cz): Debug: pop3c(mail.stable.cz): Connecting to
88.86.120.212:110
dsync(info at istan.cz): Debug: pop3c(mail.stable.cz): Authenticating as info at
istan.cz
dsync(info at istan.cz): Error: pop3c(mail.stable.cz): Server disconnected
unexpectedly
dsync(info at istan.cz): Error: pop3_migration: Failed to get header for msg 1:
Disconnected
dsync(info at istan.cz): Error: pop3_migration: Failed to get header for msg 2:
Disconnected
dsync(info at istan.cz): Error: pop3_migration: Failed to get header for msg 3:
Disconnected
dsync(info at istan.cz): Error: pop3_migration: Failed to get header for msg 4:
Disconnected

is there any timeout in dovecot for 300s? can anybody point me where may be some
problem? This error occurs everytime i test it and the mail box has cca 2GB, on
small mailboxes is no problem, i try this patch:
http://hg.dovecot.org/dovecot-2.1/rev/ab6a4455b27d on dovecot version 2.1.7 but
the problem isn't solved.

Thanks for help
Tomas Herceg

On 23.8.2012, at 16.40, TeTeHacko wrote:
> I have problems with pop3 migration, the server disconect the dovesync when
> fetching mails after 5 minutes with this error in server log:
> 
> xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6548
> xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 47522 octets
> xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6549
> xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 355289 octets
> xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6550
> xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 9638 octets
> xx.xx.xx.xx   [28F4] 11:54:05 <<< RETR 6551
> xx.xx.xx.xx   [28F4] 11:54:05 >>> +OK 2188 octets
> xx.xx.xx.xx   [28F4] 11:59:05 >>> -ERR Command unrecognized:
""
> xx.xx.xx.xx   [28F4] 11:59:05 *** <info at istan.cz> 6551 477693894
00:12:55 ERROR
> xx.xx.xx.xx   [28F4] 11:59:05 Disconnected
Looks like a bug. But in Dovecot POP3 client or the POP3 server? Apparently
either Dovecot sends an empty line after RETR or the server thinks Dovecot sends
it. Can you get the actual TCP traffic logs? and/or set pop3c_rawlog_dir and see
if it's there.