replication from slave to master

[Dmitry Melekhov]

Hello!

I get replication works with 2.3.7.

It works from master SLES9/x86 to  slave CentOS/x86-64.

Now I want to change server roles.
I changed configs and start sync_client on slave.
And get error:

Jul 17 12:54:30 backup sync_client[12963]: Doing a peer verify
Jul 17 12:54:30 backup sync_client[12963]: verify error:num=19:self 
signed certificate in certificate chain
Jul 17 12:54:30 backup sync_client[12963]: received server certificate
Jul 17 12:54:30 backup sync_client[12963]: starttls: TLSv1 with cipher 
AES256-SHA (256/256 bits new) no authentication
Jul 17 12:54:47 backup sync_client[12965]: SEEN dm user.dm
Jul 17 12:54:47 backup sync_client[12965]: seen_db: user dm opened 
/var/lib/imap/user/d/dm.seen
Jul 17 12:54:47 backup sync_client[12965]: SETSEEN received NO response: 
failed to open seen database for (user.dm, dm): System I/O error
Jul 17 12:54:47 backup sync_client[12965]:   Promoting: SEEN dm user.dm 
-> USER dm
Jul 17 12:54:47 backup sync_client[12965]: USER dm
Jul 17 12:54:47 backup sync_client[12965]: USER: Invalid type 1 response 
from server
Jul 17 12:54:47 backup sync_client[12965]: Discarding: Fatal error: 
Internal error: assertion failed: seen_db.c: 275: seendb && seendb->uni
queid


Could you help me?

If I connect to slave cyrus using imap all is OK...