Unable to map server network onto the new server

Hi,

I purchased Dell EMC with windows 2019 server on it. I am trying to connect a network drive of old server (on same network and workgroup) running windows 2008 onto this new server. I am unable to get that connected. I am able to map new server onto old server. But not old one onto new one. Both server can ping eachother's IPs so i know they are on same network and connected. I can also map both server's network drives on PC that is on same network. 

Any thoughts on how i can discover the old server onto new server's network?