Hi,
I have Zentyal as PDC for Windows clients and the DNS is in forwarder mode (to the router). Since 6.1 update, a lot of computers are experiencing randomly fails when enter in Youtube website. The browser display a network DNS error, but if I change the primary DNS (to our router directly or any external DNS like Google), everything runs okay.
Of course, this only happens in machines with Zentyal as primary DNS server. Other devices in our network have no problems at all.
Thanks in advance
EDIT: For clarify, I've detected problems with Youtube because we use it a lot, but I don't say everything else is ok. Clearly something is broken with DNS queries and domain clients since 6.1 update.