This may be your problem:
syncrepl rid=001 provider=ldaps://debian.xxx.com:636 type=refreshAndPersist credentials=mirrormode searchbase="dc=xxx,dc=com" filter="(objectClass=*)" scope=sub schemachecking=on bindmethod=simple binddn="uid=mirrormode,ou=Users,dc=xxx,dc=com" binddn="cn=syncrepl,dc=xxx,dc=com" credentials=yyy
Whats binddn is right?
[ ]'s Jarbas