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[asamule]

I have an odd problem: I am unable to upload to most people.

I can upload to some people, but most of the time a client flashes onto the queue for about a quarter of a second, then vanishes. They stay there long enough for me to see their piece graph, so I know they connected, and the protocol communicated something, but they don't stay connected.

However, some clients it does manage to upload to. Usually if it can upload to someone, it always can to that person. So it's not totally random. (I've seen it upload hundreds of megs all to the same person, while meanwhile tons of other people flash on and off the queue.)

The random part is that it doesn't always happen, some days it does, others it doesn't.

Any ideas?

[asamule]

No ideas?

It's really odd, I (involuntarily) restarted amule today, and it's uploading normally now.

[lionel77]

I am experiencing the same phenomenon. Whenever an upload slot becomes available, aMule flashes through ten people or so until it finally keeps one person in the upload slot. Because of this, I usually only have about 250 in the queue instead of the 3000 I used to have.

If you are sharing a bunch of files, this issue is not very apparent, because you are saturating your upload capacity anyway. But if you are trying to spread a new file to a small number of people, this issue becomes painfully apparent, because it is very hard to get any data to these people.

asamule, just out of curiosity, what operating system you are using?


EDIT:
I can confirm that the problem seems to be client specific rather than random. I've already uploaded 6 chunks to one particular client, but none to the other clients that have been asking for the file.

[asamule]

I'm using debian unstable.

And it is at least semi random, because one day you will restart your client, and suddenly it works for everyone.

But the rest of the time, I have the same issue as you - only certain people are able to download, but always the same people.

[lionel77]

Are you able to identify any mitigating factors?

Like the number of  (popular) files you download or share?

[asamule]

Today I got a new IP address (after being on the old one for many months), and as soon as I got the new IP I could upload like normal.

No idea what is going on, because I could (sometimes) also upload with the old IP, so it's not a definite that it's the IP.

If uploading stops with this IP I will post to let you know.

[asamule]

Well now I know what the problem is.

Maybe you have read in the news about sandvine and comcast: http://torrentfreak.com/comcast-throttles-bittorrent-traffic-seeding-impossible/

That is exactly what is going on. I turned on a packet sniffer and I watch people getting disconnected exactly at the same time an RST packet shows up.

[lionel77]

You are totally right, asamule, I agree that the problem is most likely ISP related.

The good news is that with protocol obfuscation enabled (in a current cvs build of amule) the problem seems to be mostly gone (for now).