If I enable this module, does it mean that this slapd stops receiving updates from the master?
No, it's perfectly fine to run syncprov on consumers as well.
I guess such messages are related to that my ldap is not allowing updates not? Which I want for this one.
"Server is unwilling to perform: shadow context; no update referral: connection error"
Is there some ingenious option/module that silently drops write requests? For buggy clients?