hello

I installed Roundcube and enabled managesieve in /roundcube/config/config.inc.php with

// List of active plugins (in plugins/ directory)
   $config['plugins'] = array(
      'archive',
      'managesieve',
      'zipdownload',
   );     

but the filters don't work, I get the message «Unable to connect to server» (see screenshot)

The sieve plugin seems to be installed in Dovecot, the partial output of `dovecot -n` is (see whole output at the end of this mail)

   plugin {
     sieve = file:~/sieve;active=~/.dovecot.sieve
   }    

What am I missing?

Thank you and best regards

# Pigeonhole version 0.4.18 (29cc74d)
# OS: Linux 2.6.32-042stab120.19 x86_64 CentOS Linux release 7.3.1611 (Core)
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *
mail_location = mbox:~/mail/:INBOX=mbox
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext
mbox_write_locks = fcntl
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix =
}
passdb {
   driver = pam
}
plugin {
   sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = imap pop3
service imap-login {
   inet_listener imap {
     port = 143
   }
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service pop3-login {
   inet_listener pop3 {
     port = 110
   }
   inet_listener pop3s {
     port = 995
     ssl = yes
   }
}
ssl_ca =