There are a few things that could be causing the issue here.
First - what version of VTune Analyzer are you running on your Windows 7 machine? In certain cases the version of vtserver on target may not be compatible with the installation on the host.
Next, did you get any messages when you started vtserver on the target system?
Finally, this is often caused by an actual networking issue. Please make sure you are able to ping back and forth between the 2 machines. If you have to use a fully qualified hostname or the IP address to ping to the remote system, make sure you use that same name or IP in the VTune Analyzer configuration wizard. Also try connecting the Linux machine using some other utility like SSH or FTP to make sure that works. If you have a firewall running on your Linux machine, you will need to allow VTune Analyzer to connect to it.
Please check on those things and then update this issue again with the status.