Dolphin and samba problem

I'm having problem with browsing Samba shares on my network with Dolphin on F24. I always used to enter in Network -> Samba shares in dolphin left panel and see a list of servers with samba shares on my network, but now I get "unable to find a workgroup on your local network. It may be due to firewall problems" (a rogue translation from Italian). Now, I've not changed anything in my firewall and I have SMB client ports opened. In fact, if I point directly to a server IP I can browse it (for example smb://192.168.1.200 it shows my server), so I don't think it's a firewall problem. Is anyone experiencing the same issue? Mattia