It would be an advantage for me as I travel for long periods.
It's using HTTP authentication so your browser is sending the credentials along with every request rather than using cookies and creating a server side session. Closing the browser is sufficient unless you have told it to remember the password.
I think setting up a VPN would answer this use case too as your remote machine would be seen as being on your home network via a secure tunnel. Then just access with your home ip address for the humax (e.g 192.168.x.x).
Regarding the VPN suggestion. Its not exactly SSH. SSH sets up a tunnel onto a machine allowing you to run command prompt commands from that shell window.
A VPN usually involves some small setup on your home networks router to allow something like a PPTP VPN, hard to advise as each router is slightly different. You then run a client on your remote machine (I mention PPTP because windows comes with the client by default). The client establishes a connection to your home router and from that point on your machine behaves exactly as though your internet connection was established from within your home network. You will have full access to your home networks devices by using their local ip addresses for example 192.168.x.x. This means no port forwarding would be needed. All encryption and authentication is handled by the VPN making it look like you were a device on the local network. Also you would not need to open your humax or any ports up to the dark world of the internet as it would see itself as being accessed from its local network
I think you might need to be careful. I hear China is touchy about uncensored Internet access, and sending encrypted traffic or using a VPN might be seen as a means to bypass the censorship system and have the authorities down on you. I may be wrong, but I think you need to be sure what the situation is.
Ah, good point Black Hole I hadnt thought about that. However after some digging for what is legal I found http://www.streetarticles.com/cyber-law/vpn-in-china-is-it-legal. Seems it isnt illegal and a use such as communicating with a home network wouldnt pose any problems. However it seems its best to use something other than PPTP and L2TP as they are disabled for one reason or another.
With regards to security you can indeed use SSH to achieve your VPN. There are many guides online, simply search for "VPN" and "SSH" for example http://bodhizazen.net/Tutorials/VPN-Over-SSH