[Dovecot] managesieve proxy cyrus

Hello all,

I've configured a dovecot server in proxy mode. It seems to work well but. I've tested managesieve with squirrelmail and it's working correctly but I can't connect to cyrus sieve server : timsieved

Does anybody here have configure a sieve proxy to do this ?

Or is it a normal behavior and dovecot sieve proxy can't speak with cyrus sieve ?

Thanks.