host verification failed Invalid address

Hello,

I've been trying to use the remote testing feature in TestComplete. I have one of my test machines that connects as a remote host but the other three machines fail during the initial Verify Host process. With error message " Verification failed xxxxxxx(xxxxxxx) Invalid address." I can connect with these machines via Windows Remote DeskTop using the same computer name, domain, user and password. Any suggestions on what may be wrong here?

Thank you.