How to set up manual port forwarding?
In most cases DC++ should be able to automatically detect the appropriate
connection method for the user, however, there can still be cases when there
are no ways to map the port automatically so a manual configuration required
to achieve active mode. This FAQ gives detailed information how to set up
port forwarding manually in case of the automatic connectivity
setup fails or you have gateway devices without automatic
port mapping support.
This FAQ assumes that
- You're familiar with DC++ connectivity concepts
- You already tried the automatic ways of port mapping
without success (or you are certain that you don't have supporting devices
in your network)
- You have basic understanding of computer networking
- You have proper access to the configuration layout of your gateway (router)
For DC++ to work properly in active mode, it requires access on TCP and UDP listening
ports, as well as outgoing access on all ports for both TCP and UDP. If you
are in a private network behind a NAT device the incoming information to the
listening ports should be forwarded to the proper computer.
For an in-depth, but still easy to understand explanation of port
forwarding, read What is Port Forwarding? The following
steps describe the configuration of port forwarding in general as the exact
configuration method and layout varies in the different type of gateway
- First you need to set up the router to forward the connections to the
computer with DC++. This is could be called Port mapping, port redirecting,
port forwarding or something like that in your router configuration. Find
out how to do this with your router / NAT in
the user manual came with your device.
- You need to forward three ports: 2 ports for transfers and encrypted
transfers (both use TCP protocol) and one port for searches what uses the
UDP protocol. You can use the same port number for transfers and searches,
but you need a different one for the encrypted transfers. Of course
you can choose different port numbers for each as well. So select two or
three numbers between 1024 - 65535, they should mostly all be free. Make
sure you select the correct protocol types (TCP, UDP or Both) for
each port number when you cerate the port forwarding rules in the gateway's
- The IP that you are forwarding to should be the internal IP address
of your computer running DC++. It usually begins with "192.168", "172.16." or "10.x.". To see your internal IP
address go to the command prompt and type: ipconfig (Start Menu ->
Run -> cmd /k ipconfig)
- When you have mapped the port(s) on the router, open up DC++ and go to Manual configuration settings. Select Active mode (I have
no router / I have configured my router). In the port fields, enter the
port number(s) that you forwarded on the router.
- In the External / WAN IP field, you need to enter the external IP
address of your router. Your external IP can be checked on DSLReport's IP page or at WhatIsMyIP.com.
- Active mode should now be working. For checking or troubleshooting if you
have properly forwarded the port(s) to DC++, use www.canyouseeme.org. Make sure DC++ is open. Then, in the
site, enter the port you're forwarded and click Check. If everything has
been properly set up, the site should say Success. If you get an error
message in red, then you need to double-check the port forwarding on the
router, DC++ settings and possibly your built-in or 3rd party
software firewall settings.
TIP:Before you fill out the required settings it may worth to check
if DC++ is able to automatically detect some of the required parameters. To
do this, go to the Connectivity pane in the Settings, enable
automatic connectivity detection, click 'Detect Now' and when the
detection is finished click 'Edit detected settings'. Depending on the
results this way you may speed up setting up manual port forwarding if DC++
is able to detect any subset of the required settings.
If you have problems finding the correct port forwarding settings in your
gateway setup you may get detailed help, how-to guide and screen shots for
various router models at www.portforward.com. There is a
huge list of models there, click on your model name, then select DC++ from
the list of applications. An interactive guide will appear to help you how
to access your router's configuration page and how to set up port forwarding
for DC++. You can find some more how-to's for popular router models at the
DSLReport FAQ page as well.
If active mode is working for a while, but the next time when you use
DC++, you only get Connection Timeouts or no results when
searching, your IP (either external or internal) is likely to
have changed. Of course you can update your IP settings manually each time
they changed, but there are better solutions to avoid constant IP address
If you find the external IP is constantly changing, you can sign up to a
free dynamic DNS service such as No-IP , Dynip or FreeDNS and put your dynamic DNS
address into the External / WAN IP field in DC++ Connection
Settings. Each DDNS provider has a downloadable IP updater software what
updates the dynamic name service with your latest IP. Make sure you
download, configure and run this program while using DC++. Many router
models have DDNS client software included for specific DDNS provider(s) so
it worth a check in your router configurations before choosing a
provider. After you setup the built-in DDNS client you won't need to run any
IP updater software, your router will automatically take care of updating
your DNS name.
- If you find that your internal IP changes when you restart your computer
then your operating system is obtaining an IP address from your router at
boot using DHCP protocol. If you want your computer to
always have the same internal IP address you must setup Static DHCP in your
router configuration. Static DHCP is a useful feature which makes your
router always assign the same IP address to a specific computer on your
network. You will have to find MAC address of your network
card to set up Static DHCP.
Another option to ensure you'll always have the same internal IP address is
to set up static IP address for your computer. Here's a FAQ
how to do this for different versions of Windows.
Besides normal file transfers DC++ is capable of secure (SSL encrypted) way of receiving and transmitting files on ADC
hubs. If you're able to download in NMDC hubs but not in ADC ones then most
probably you have a problem with the secure transfer port. You should check
if the secure transfer port is forwarded correctly to be able to download
from ADC users who have secure transfers enabled.