Help with weird rtmpdump behavior in video capture

[4n0n1m3m6]

Hi,
I'm new in video recording and I'm having some problems to dump a video but I think it can be an issue on my rtmpdump version.

I'm using rtmpdump 2.4 with last KSV patch (2015-05-04).

When I try to execute the following on ubuntu 15.04, I'm getting an error:

rtmpdump -r "rtmpe://l.mybeststream.xyz/r/" -a "r/" -f "LNX 17,0,0,134" -W "http://mybeststream.xyz/06609ca7948bff402cc83cf42ed7269c/player1.swf" -p "http://mybeststream.xyz/?id=24040&width=660&height=380&id=mediaspace2" -y "noticias147" --live -o "test.flv"
RTMPDump v2.4
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
WARNING: Trying different position for server digest!
INFO: Connected...
ERROR: rtmp server sent error
ERROR: rtmp server requested close

When I try to execute the same on Windows 8.1 (with latest KSV patch also) under VM this works perfectly.

What this sounds like ? Do you have any idea ?

Thanks