Computer in the online list shows (unknown) after alias, cannot connect to it

[waves]

I recently installed Teamviewer 8 on an Win XP PC but it shows (unknown) after the Alias from the beginning. I thought it was weird as it never happened before but since I was able to connect to it initially, I didn't think much of it. I just tried to connect to it and I get "connection could not be established". Any idea what's wrong with it?

[Admin]

I would just delete the entry and then re add it to your list and see what happens