Remote Desktop

I have several remote 2003 servers that I remote (Remote Desktop) into from
my Windows XP machine. Of them I have four that are giving me this error
message when I try to remote back in to them:

The client could not establish a connection to the remote computer.
>
>The most likely causes for this error are:
>
>1) Remote connections might not be enabled at the remote computer.
>2) The maximum number of connections was exceeded at the remote computer.
>3) A network error occurred while establishing the connection.

My question is this: is there a way that I can view the connections to
these machines and disconnect them?

Thanks!
sro