[CrazyNash]

I don't think i'm banned. How could i check that ? The site works fine in any browser.

In the meanwhile, i installed the exact same packages on another computer (hosted online server), still on ubuntu (but 14.02 this time) and there everything works (exact same rtmpdump KSV version).
My local ubuntu is an old homemade-NAS running Ubuntu 12.04.

rtmpdump doesn't seem to have a lot of dependencies (libc and librtmp), so it's a bit weird.

The other difference is that my old precise ubuntu is running "at home" whereas the newer one is running directly online : could it be a network issue (port blocked by router / cable box) ?