I Believe you can simply type an IP address to access the network drive if its the root folder however i just checked my nodes and they all have UNC paths. I wonder if the problem lies in the way the drives are mapped then. for example they arent physical drives, theyre all on the same physical drive but i have seperate drives set up for different folders within my server. Could it be a server problem? Im using an actual server with the nodes connected instead of directly being connected to a simple router.
It could be something like this. In my setup it's very simple. I have one workstation with 3 physical drives all shared on the network with Advanced Sharing Permissions, F, H and Z. The two rendernodes have those drives mapped to the same drive letters, so they are effectively identical paths. e.g. F:\projects\project1\maps\ is the same for all machines. VRay handles this perfectly. There is no transfer of assets required, other than shoving them across the network via my switch. The nodes recognise the assets as being "ok" i.e. Local. Not network paths. This simplifies my process enormously because I never need to worry about any missing assets at all, as long as they're not in C:\ anywhere. I don't need to worry if I use local absolute paths or UNC, it's all the same.
But when it comes to Corona it doesn't want to play ball... UNC = fine. Absolute = no maps. If VRay can handle it then I guess it's an issue with Corona, not with my network or windows or firewalls etc.