[Dovecot] proxy, managesieve and ssl?

Hello,

On a dovecot 2.0.14 proxy, I found that proxying managesieve works well when using 'starttls' option in pass_attrs, but does not work when using 'ssl' option. The backend server is also dovecot 2.0.14; when using the ssl option, it reports "no auth attempts" in the logs about managesieve-login, and meanwhile the MUA, Thunderbird with sieve plugin, reports [TRYLATER] account is temporary disabled; no problem when using starttls option on the proxy, all works well.

I would like to use IMAPs, instead of IMAP+STARTTLS, from proxy to backend, and have Managesieve still working. Is this supported?

Thanks,

Nicolas