Can't make a PC-PC connection, but Cellphone-PC works

I have the latest version (13.1.3629) installed in both my PC's, WORK and HOME. I can't connect from home to work or vice versa. In the TeamViwer website, menu "My Computers", the HOME PC appears to be offline, but I know it's online and with TeamViwer on. But, if I try to connect with my cell phone to the PC at home, it works fine. It take a few attempts, but it works.

Does somebody have any idea of what's going on? Thanks.

ps - I don't have any antivirus installed in both machines.