You need to configure a remote system from the OLT console (tools menu, I dont have the GUI in front of me).
You need to make sure that your agent is running. There's a script to test agent status.
You also need to make sure that both machine can talk to each other with the same name & IP. OLT is quite sensible to that. Most of communication issues between OLT server and agents are due to bad name resolution. Better to update /etc/hosts on both sides with IP & names.
Please give a try and let us know