cannot connect two ubuntu machines
I have two ubuntu machines in my shop. one is ubuntu desktop 16.0 LTS. ( my pc ), and the other one is ubuntu Mate 14.0 LTS. ( for the users ). the problem is that few days before I was able to connect with the user's machine from my ubunu desktop. I installed samba, nautilus-share, openssh-server/client on both machines. but , for some days I am facing a connectivity issues with that machine ( MATE for the user). I cannot LAN that machine as well as not getting any access on its drive.
what is the solutions for this issue, that I can fix it.
any help would be appreciated.