Skullcrusher : FAQ

Contents

Site information
- What is this bittorrent all about anyway? How do I get the files?

User information

Stats

Uploading
- Why can't I upload torrents?
- What criteria must I meet before I can join the Uploader team?

Downloading

How can I improve my download speed?

My ISP uses a transparent proxy. What should I do?

Why can't I connect? Is the site blocking me?
- Maybe my address is blacklisted?
- Your ISP blocks the site's address

What if I can't find the answer to my problem here?
- You can try these:

Site information - Top

What is this bittorrent all about anyway? How do I get the files?

Check out Brian's BitTorrent FAQ and Guide

User information - Top

I registered an account but did not receive the confirmation e-mail!

You can use this form to delete the account so you can re-register. Note though that if you didn't receive the email the first time it will probably not succeed the second time either so you should really try another email address.

Why is my port number reported as "---"? (And why should I care?)

The tracker has determined that you are firewalled or NATed and cannot accept incoming connections.

This means that other peers in the swarm will be unable to connect to you, only you to them. Even worse, if two peers are both in this state they will not be able to connect at all. This has obviously a detrimental effect on the overall speed.

The way to solve the problem involves opening the ports used for incoming connections (the same range you defined in your client) on the firewall and/or configuring your NAT server to use a basic form of NAT for that range instead of NAPT (the actual process differs widely between different router models. Check your router documentation and/or support forum. You will also find lots of information on the subject at PortForward).

I've lost my user name or password! Can you send it to me?

Please use this form to have the login details mailed back to you.

Can you delete my account?

You cannot delete your own account, please ask a member of staff

So, what's MY ratio?

Click on your profile, then on your user name (at the top).

It's important to distinguish between your overall ratio and the individual ratio on each torrent you may be seeding or leeching. The overall ratio takes into account the total uploaded and downloaded from your account since you joined the site. The individual ratio takes into account those values for each torrent.

You may see two symbols instead of a number: "Inf.", which is just an abbreviation for Infinity, and means that you have downloaded 0 bytes while uploading a non-zero amount (ul/dl becomes infinity); "---", which should be read as "non-available", and shows up when you have both downloaded and uploaded 0 bytes (ul/dl = 0/0 which is an indeterminate amount).

Why is my IP displayed on my details page?

Only you and the site moderators can view your IP address and email. Regular users do not see that information.

Help! I cannot login!?

This problem sometimes occurs with MSIE. Close all Internet Explorer windows and open Internet Options in the control panel. Click the Delete Cookies button. You should now be able to login.

My IP address is dynamic. How do I stay logged in?

You do not have to anymore. All you have to do is make sure you are logged in with your actual IP when starting a torrent session. After that, even if the IP changes mid-session, the seeding or leeching will continue and the statistics will update without any problem.

Stats - Top

Most common reason for stats not updating

The user is cheating. (a.k.a. "Summary Ban")
The server is overloaded and unresponsive. Just try to keep the session open until the server responds again. (Flooding the server with consecutive manual updates is not recommended.)

How does NAT/ICS change the picture?

This is a very particular case in that all computers in the LAN will appear to the outside world as having the same IP. We must distinguish between two cases:

1. You are the single user in the LAN

You should use the same account in all the computers.

Note also that in the ICS case it is preferable to run the BT client on the ICS gateway. Clients running on the other computers will be unconnectable (their ports will be listed as "---", as explained elsewhere in the FAQ) unless you specify the appropriate services in your ICS configuration (a good explanation of how to do this for Windows XP can be found here). In the NAT case you should configure different ranges for clients on different computers and create appropriate NAT rules in the router. (Details vary widely from router to router and are outside the scope of this FAQ. Check your router documentation and/or support forum.)

2. There are multiple users in the LAN

At present there is no way of making this setup always work properly. Each torrent will be associated with the user who last accessed the site from within the LAN before the torrent was started. Unless there is cooperation between the users mixing of statistics is possible. (User A accesses the site, downloads a .torrent file, but does not start the torrent immediately. Meanwhile, user B accesses the site. User A then starts the torrent. The torrent will count towards user B's statistics, not user A's.)

It is your LAN, the responsibility is yours. Do not ask us to ban other users with the same IP, we will not do that. (Why should we ban him instead of you?)

Best practices

If a torrent you are currently leeching/seeding is not listed on your profile, just wait or force a manual update.
Make sure you exit your client properly, so that the tracker receives "event=completed".
If the tracker is down, do not stop seeding. As long as the tracker is back up before you exit the client the stats should update properly.

May I use any bittorrent client?

Yes. The tracker now updates the stats correctly for all bittorrent clients. However, we still recommend that you avoid the following clients:

� BitTorrent++,
� Nova Torrent,
� TorrentStorm.

These clients do not report correctly to the tracker when canceling/finishing a torrent session. If you use them then a few MB may not be counted towards the stats near the end, and torrents may still be listed in your profile for some time after you have closed the client.

Also, clients in alpha or beta version should be avoided.

Why is a torrent I'm leeching/seeding listed several times in my profile?

If for some reason (e.g. pc crash, or frozen client) your client exits improperly and you restart it, it will have a new peer_id, so it will show as a new torrent. The old one will never receive a "event=completed" or "event=stopped" and will be listed until some tracker timeout. Just ignore it, it will eventually go away.

I've finished or cancelled a torrent. Why is it still listed in my profile?

Some clients, notably TorrentStorm and Nova Torrent, do not report properly to the tracker when canceling or finishing a torrent. In that case the tracker will keep waiting for some message - and thus listing the torrent as seeding or leeching - until some timeout occurs. Just ignore it, it will eventually go away.

Why do I sometimes see torrents I'm not leeching in my profile!?

When a torrent is first started, the tracker uses the IP to identify the user. Therefore the torrent will become associated with the user who last accessed the site from that IP. If you share your IP in some way (you are behind NAT/ICS, or using a proxy), and some of the persons you share it with are also users, you may occasionally see their torrents listed in your profile. (If they start a torrent session from that IP and you were the last one to visit the site the torrent will be associated with you). Note that now torrents listed in your profile will always count towards your total stats.

Uploading - Top

Why can't I upload torrents?

Only specially authorized users (Uploaders) have permission to upload torrents.

What criteria must I meet before I can join the Uploader team?

You must be able to provide releases that:
� include a proper NFO,
� are genuine scene releases. If it's not on NFOrce then forget it! (except music).
� are not older than seven (7) days,
� have all files in original format (usually 14.3 MB RARs),
� you'll be able to seed, or make sure are well-seeded, for at least 24 hours.
� you should have atleast 2MBit upload bandwith.

If you think you can match these criteria do not hesitate to contact one of the administrators.
Remember! Write your application carefully! Be sure to include your UL speed and what kind of stuff you're planning to upload.
Only well written letters with serious intent will be considered.

Downloading - Top

How do I use the files I've downloaded?

Check out this guide.

Downloaded a movie and don't know what CAM/TS/TC/SCR means?

Check out this guide.

Why did an active torrent suddenly disappear?

There may be three reasons for this:
(1) The torrent may have been out-of-sync with the site rules.
(2) The uploader may have deleted it because it was a bad release. A replacement will probably be uploaded to take its place.
(3) Torrents are automatically deleted after 28 days.

How do I resume a broken download or reseed something?

Open the .torrent file. When your client asks you for a location, choose the location of the existing file(s) and it will resume/reseed the torrent.

Why do my downloads sometimes stall at 99%?

The more pieces you have, the harder it becomes to find peers who have pieces you are missing. That is why downloads sometimes slow down or even stall when there are just a few percent remaining. Just be patient and you will, sooner or later, get the remaining pieces.

What are these "a piece has failed an hash check" messages?

Bittorrent clients check the data they receive for integrity. When a piece fails this check it is automatically re-downloaded. Occasional hash fails are a common occurrence, and you shouldn't worry.

Some clients have an (advanced) option/preference to 'kick/ban clients that send you bad data' or similar. It should be turned on, since it makes sure that if a peer repeatedly sends you pieces that fail the hash check it will be ignored in the future.

The torrent is supposed to be 100MB. How come I downloaded 120MB?

See the hash fails topic. If your client receives bad data it will have to redownload it, therefore the total downloaded may be larger than the torrent size. Make sure the "kick/ban" option is turned on to minimize the extra downloads.

Why do I get a "Not authorized (xx h) - READ THE FAQ" error?

From the time that each new torrent is uploaded to the tracker, there is a period of time that some users must wait before they can download it.
This delay in downloading will only affect users with a low ratio, and users with low upload amounts.

Ratio below	0.50	and/or upload below	5.0GB	delay of	48h
Ratio below	0.65	and/or upload below	6.5GB	delay of	24h
Ratio below	0.80	and/or upload below	8.0GB	delay of	12h
Ratio below	0.95	and/or upload below	9.5GB	delay of	06h

"And/or" means any or both. Your delay will be the largest one for which you meet at least one condition.

This applies to new users as well, so opening a new account will not help. Note also that this works at tracker level, you will be able to grab the .torrent file itself at any time.

N.B. Due to some users exploiting the 'no-delay-for-seeders' policy we had to change it. The delay now applies to both seeding and leeching. So if you are subject to a delay and get the files from some other source you will not be able to seed them until the delay has elapsed.

Why do I get a "rejected by tracker - Port xxxx is blacklisted" error?

Your client is reporting to the tracker that it uses one of the default bittorrent ports (6881-6889) or any other common p2p port for incoming connections.

This tracker does not allow clients to use ports commonly associated with p2p protocols. The reason for this is that it is a common practice for ISPs to throttle those ports (that is, limit the bandwidth, hence the speed).

The blocked ports list include, but is not neccessarily limited to, the following:

Direct Connect	411 - 413
Kazaa	1214
eDonkey	4662
Gnutella	6346 - 6347
BitTorrent	6881 - 6889

In order to use use our tracker you must configure your client to use any port range that does not contain those ports (a range within the region 49152 through 65535 is preferable, cf. IANA). Notice that some clients, like Azureus 2.0.7.0 or higher, use a single port for all torrents, while most others use one port per open torrent. The size of the range you choose should take this into account (typically less than 10 ports wide. There is no benefit whatsoever in choosing a wide range, and there are possible security implications).

These ports are used for connections between peers, not client to tracker. Therefore this change will not interfere with your ability to use other trackers (in fact it should increase your speed with torrents from any tracker, not just ours). Your client will also still be able to connect to peers that are using the standard ports. If your client does not allow custom ports to be used, you will have to switch to one that does.

Do not ask us, or in the forums, which ports you should choose. The more random the choice is the harder it will be for ISPs to catch on to us and start limiting speeds on the ports we use. If we simply define another range ISPs will start throttling that range also.

Finally, remember to forward the chosen ports in your router and/or open them in your firewall, should you have them.

What's this "IOError - [Errno13] Permission denied" error?

If you just want to fix it reboot your computer, it should solve the problem. Otherwise read on.

IOError means Input-Output Error, and that is a file system error, not a tracker one. It shows up when your client is for some reason unable to open the partially downloaded torrent files. The most common cause is two instances of the client to be running simultaneously: the last time the client was closed it somehow didn't really close but kept running in the background, and is therefore still locking the files, making it impossible for the new instance to open them.

A more uncommon occurrence is a corrupted FAT. A crash may result in corruption that makes the partially downloaded files unreadable, and the error ensues. Running scandisk should solve the problem. (Note that this may happen only if you're running Windows 9x - which only support FAT - or NT/2000/XP with FAT formatted hard drives. NTFS is much more robust and should never permit this problem.)

What's this "TTL" in the browse page?

The torrent's Time To Live, in hours. It means the torrent will be deleted from the tracker after that many hours have elapsed (yes, even if it is still active). Note that this a maximum value, the torrent may be deleted at any time if it's inactive.

How can I improve my download speed? - Top

Do not immediately jump on new torrents

The download speed mostly depends on the seeder-to-leecher ratio (SLR). Poor download speed is mainly a problem with new and very popular torrents where the SLR is low.

(Proselytising sidenote: make sure you remember that you did not enjoy the low speed. Seed so that others will not endure the same.)

There are a couple of things that you can try on your end to improve your speed:

In particular, do not do it if you have a slow connection. The best speeds will be found around the half-life of a torrent, when the SLR will be at its highest. (The downside is that you will not be able to seed so much. It's up to you to balance the pros and cons of this.)

Limit your upload speed

The upload speed affects the download speed in essentially two ways:

Bittorrent peers tend to favour those other peers that upload to them. This means that if A and B are leeching the same torrent and A is sending data to B at high speed then B will try to reciprocate. So due to this effect high upload speeds lead to high download speeds.
Due to the way TCP works, when A is downloading something from B it has to keep telling B that it received the data sent to him. (These are called acknowledgements - ACKs -, a sort of "got it!" messages). If A fails to do this then B will stop sending data and wait. If A is uploading at full speed there may be no bandwidth left for the ACKs and they will be delayed. So due to this effect excessively high upload speeds lead to low download speeds.

The full effect is a combination of the two. The upload should be kept as high as possible while allowing the ACKs to get through without delay. A good thumb rule is keeping the upload at about 80% of the theoretical upload speed. You will have to fine tune yours to find out what works best for you. (Remember that keeping the upload high has the additional benefit of helping with your ratio.)

If you are running more than one instance of a client it is the overall upload speed that you must take into account. Some clients (e.g. Azureus) limit global upload speed, others (e.g. Shad0w's) do it on a per torrent basis. Know your client. The same applies if you are using your connection for anything else (e.g. browsing or ftp), always think of the overall upload speed.

Limit the number of simultaneous connections

Some operating systems (like Windows 9x) do not deal well with a large number of connections, and may even crash. Also some home routers (particularly when running NAT and/or firewall with stateful inspection services) tend to become slow or crash when having to deal with too many connections. There are no fixed values for this, you may try 60 or 100 and experiment with the value. Note that these numbers are additive, if you have two instances of a client running the numbers add up.

Limit the number of simultaneous uploads

Isn't this the same as above? No. Connections limit the number of peers your client is talking to and/or downloading from. Uploads limit the number of peers your client is actually uploading to. The ideal number is typically much lower than the number of connections, and highly dependent on your (physical) connection.

Just give it some time

As explained above peers favour other peers that upload to them. When you start leeching a new torrent you have nothing to offer to other peers and they will tend to ignore you. This makes the starts slow, in particular if, by change, the peers you are connected to include few or no seeders. The download speed should increase as soon as you have some pieces to share.

Why is my browsing so slow while leeching?

Your download speed is always finite. If you are a peer in a fast torrent it will almost certainly saturate your download bandwidth, and your browsing will suffer. At the moment there is no client that allows you to limit the download speed, only the upload. You will have to use a third-party solution, such as NetLimiter.

Browsing was used just as an example, the same would apply to gaming, IMing, etc...

My ISP uses a transparent proxy. What should I do? - Top

What is a proxy?

Basically a middleman. When you are browsing a site through a proxy your requests are sent to the proxy and the proxy forwards them to the site instead of you connecting directly to the site. There are several classifications (the terminology is far from standard):

Transparent		A transparent proxy is one that needs no configuration on the clients. It works by automatically redirecting all port 80 traffic to the proxy. (Sometimes used as synonymous for non-anonymous.)
Explicit/Voluntary		Clients must configure their browsers to use them.
Anonymous		The proxy sends no client identification to the server. (HTTP_X_FORWARDED_FOR header is not sent; the server does not see your IP.)
Highly Anonymous		The proxy sends no client nor proxy identification to the server. (HTTP_X_FORWARDED_FOR, HTTP_VIA and HTTP_PROXY_CONNECTION headers are not sent; the server doesn't see your IP and doesn't even know you're using a proxy.)
Public		(Self explanatory)

A transparent proxy may or may not be anonymous, and there are several levels of anonymity.

How do I find out if I'm behind a (transparent/anonymous) proxy?

Try ProxyJudge. It lists the HTTP headers that the server where it is running received from you. The relevant ones are HTTP_CLIENT_IP, HTTP_X_FORWARDED_FOR and REMOTE_ADDR.

Why is my port listed as "---" even though I'm not NAT/Firewalled?

The tracker is quite smart at finding your real IP, but it does need the proxy to send the HTTP header HTTP_X_FORWARDED_FOR. If your ISP's proxy does not then what happens is that the tracker will interpret the proxy's IP address as the client's IP address. So when you login and the tracker tries to connect to your client to see if you are NAT/firewalled it will actually try to connect to the proxy on the port your client reports to be using for incoming connections. Naturally the proxy will not be listening on that port, the connection will fail and the tracker will think you are NAT/firewalled.

Can I bypass my ISP's proxy?

If your ISP only allows HTTP traffic through port 80 or blocks the usual proxy ports then you would need to use something like socks and that is outside the scope of this FAQ.

Otherwise you may try the following:

Choose any public non-anonymous proxy that does not use port 80 (e.g. from this, this or this list).
Configure your computer to use that proxy. For Windows XP, do Start, Control Panel, Internet Options, Connections, LAN Settings, Use a Proxy server, Advanced and type in the IP and port of your chosen proxy. Or from Internet Explorer use Tools, Internet Options, ...
(Facultative) Visit ProxyJudge. If you see an HTTP_X_FORWARDED_FOR in the list followed by your IP then everything should be ok, otherwise choose another proxy and try again.
Visit this site. Hopefully the tracker will now pickup your real IP (check your profile to make sure).

Notice that now you will be doing all your browsing through a public proxy, which are typically quite slow. Communications between peers do not use port 80 so their speed will not be affected by this, and should be better than when you were "unconnectable".

How do I make my bittorrent client use a proxy?

Just configure Windows XP as above. When you configure a proxy for Internet Explorer you re actually configuring a proxy for all HTTP traffic (thank Microsoft and their "IE as part of the OS policy" ). On the other hand if you use another browser (Opera/Mozilla/Firefox) and configure a proxy there you'll be configuring a proxy just for that browser. We don't know of any BT client that allows a proxy to be specified explicitly.

Why can't I signup from behind a proxy?

It is our policy not to allow new accounts to be opened from behind a proxy.

Why can't I connect? Is the site blocking me? - Top

Maybe my address is blacklisted?

The site blocks addresses listed in the (former) PeerGuardian database, as well as addresses of banned users. This works at Apache/PHP level, it's just a script that blocks logins from those addresses. It should not stop you from reaching the site. In particular it does not block lower level protocols, you should be able to ping/traceroute the server even if your address is blacklisted. If you cannot then the reason for the problem lies elsewhere.

If somehow your address is indeed blocked in the PG database do not contact us about it, it is not our policy to open ad hoc exceptions. You should clear your IP with the database maintainers instead.

Your ISP blocks the site's address

(In first place, it's unlikely your ISP is doing so. DNS name resolution and/or network problems are the usual culprits.)
There's nothing we can do. You should contact your ISP (or get a new one). Note that you can still visit the site via a proxy, follow the instructions in the relevant section. In this case it doesn't matter if the proxy is anonymous or not, or which port it listens to.

Notice that you will always be listed as an "unconnectable" client because the tracker will be unable to check that you're capable of accepting incoming connections.

What if I can't find the answer to my problem here? - Top

You can try these:

Post in the Forums, by all means. You'll find they are usually a friendly and helpful place, provided you follow a few basic guidelines:

Make sure your problem is not really in this FAQ. There's no point in posting just to be sent back here.
Before posting read the sticky topics (the ones at the top). Many times new information that still hasn't been incorporated in the FAQ can be found there.
Help us in helping you. Do not just say "it doesn't work!". Provide details so that we don't have to guess or waste time asking. What client do you use? What's your OS? What's your network setup? What's the exact error message you get, if any? What are the torrents you are having problems with? The more you tell the easiest it will be for us, and the more probable your post will get a reply.
And needless to say: be polite. Demanding help rarely works, asking for it usually does the trick.