Last week, I tried to Subscribe using Kubuntu. It didn't work.
The server stopped responding. I tried a couple of times without success.
Today I had the same problem and I told myself "Maybe this Linux site, requires Windows to subscribe !"
So I subscribed with windows. Then I seached the messages boards and the answer was there !
I think for a Linux Magazine, we should be able to use Linux to access it (even the subscription part).
Since it's the first time I have had this problem, thanks for the help.
But I would suggest, that on the font page of the subscription page there should me a warning: "If you use Linux, read this important message...".