Clients dont see the Zentyal Server in "network neighborhood", but he is there

[ATT1]

Hello,
I have a Zentyal 7.0 server. Samba, Domain and user auth work fine. However the Win7,8,10 clients cannot see the Zentyal server and his name ("srv01") under the "network neighborhood". He seems to be invisible. However, typing in "\\srv01" in the file explorer neatly reveals all neccessary shares, etc.
What do I have to do so the Windows clients can see the server in "network neighborhood" ?

[jshanks]

Same problem exists with Zentyal 8.0.    I have multiple servers, different OSs that I'm testing, including real Windows server and Samba on Redhat, and the Zentyal server is the only one that doesn't appear in the "Network" area of the windows explorer.