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Old 2003-11-04, 08:12   Link #7
F&C Fanboy
Join Date: Nov 2003
Location: Saiph
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Firewall and Router Problems

We all know how BitTorrent works ( Right? ) but sometimes we still have little problems here and there.
One of those little problems is the one connected with Firewalls and Routers.

A Firewall is a software (or hardware) that protects your PC from incoming connection (like Trojans, Hackers, etc...) but the problem is that it usually blocks every connection, bad or good (<-- our loved BT).
A Router is a little box (different from your external modem) that connects your PC to the internet line and its equipped with an internal Firewall.

Your download speed is proportional to the number of people connected to your client, if a lot of people are connected with your client, you will (usually) get a better speed, and thus, if your firewall blocks them, your speed will suffer a lot from that.
BitTorrent connects you to the "world" by some ports, those ports are the main point of your problem, since your Firewall/Router usually blocks them. The ports are the ones between 6881 and 6889.

Now, lets list the problems (and the possible solution) connected with ports opening:
  • Software Firewall: Its a common problem, your firewall is probably blocking the ports. Try to disable your Firewall while using your client, and see if BT is able to connect to some remote clients (A Remote client is a "connecion" behind a router or a firewall). You can check the list of client in the "Advanced" menu located in the lower left part of your client.
    If the problem is your Firewall, you are set! If you need to download anything via-BT, just remove the Firewall for a while, and set it back once your DL is complete.

  • Router: The dreaded router, the magical box that protects you from the evilness of the internet. The same problem is located here, but with a little variant... you cant "remove" your router, so the only way possible is to open the infamous ports (6881-6889) and let BT connect to you without problems.
    There is no real general way to open ports, you have to pick your Router manual (Yes, that 7500pages book hidden somewhere in your room) and read if you can open the ports, and how to open them. You can see if you have them opened in the Advanced menu. If you see a Remote Connection (r), you are done, your ports are forwarded now.

  • Seeds Sometimes your speed in not caused by any of the things said above. The problem might be the ammount of seeds and peers. If there are no seeds, you wont be able to finish the file, and thus you will probably get a 0k/s. Same if the beers and seeds are on a slow connection. You cant expect 500k/s from someone with a 56k modem... right? Be carefull about those things, a good way to spot if you are actually connected with peoples in Remote is to check the "Advanced" Tab.

Last edited by Flash_Squirrel; 2003-11-23 at 08:32.
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