Managed switches (and clients) failing to resolve local names.

Hi all, Recently I installed managed switches (multiple GS110 v3 and GS724 Managed switches) throughout my company.

Since putting these in, I have noticed that clients connected to the switch and the switch itself can no longer perform local DNS lookups for hosts on my LAN.

E.g. with my old switches I'd be able to ping host1 and it would resolve the name to x.x.x.x and ping it..

Now with the new switches it cannot find the host... (all machines are windows based not AD joined)

The DNS server is our 4011 Mik and that has been set on all the switches too...

Normal network access works fine, it's just on our LAN...

Any ideas or suggestions?

Thanks in advance.