Cannot access SMB shares on android TV

Hi guys, I’ve got a new install of Kodi 17.3 on my android tv but I cannot seem to access my SMB shares. I’ve tried using the computer name and IP address but it wont connect. The message is always “Connection timed out”.

The shares are on my Windows 7 PC which I can access using EFS File Explorer from the TV.

I’ve read a number of posts related to similar issues but none of the fixes have helped. Is there some kind of bug in the build?

Any help or advice would be appreciated.