I can ping the nodes (1 linux and 1 Windows 10 Pro) and a status poll says the node is connected however a configuration poll can't connect to the nxagent and says it is an internal error.
Hi,
most likely you did not specify correct address of NetXMS server in agent's configuration file. You can run agent with debug level 6 and check what is going on during connection attempt from server.
Best regards,
Victor