Ping the remote computer from the local computer. If it cannot
be pinged:
Ensure that the IP address or DNS name of the remote computer
is valid and accessible by pinging it from itself and from any
other linked computers.
If the remote computer is not accessible by network topology,
refer to the "connecting over LAN"
help section for details.
Scan the remote computer for an open
port (4899 by default). You can use the build-in scanner or any port-scanning software of
your choice. If this fails:
Check the port settings on the
remote computer to ensure that you are using the correct port.
If the remote computer has a firewall installed, make sure it
is correctly configured.
Windows 7 has a built-in firewall
that may be active.
Configure any proxies/routers between the local and remote
computer so they allow connections on the target port.