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Universal Plug And Play (UPnP) is a technology to allow, among other things, Internet applications to configure home routers and gateways, bypassing manual port forwarding configuration. UPnP was introduced in Windows XP and is supported in that and later versions, including Windows 7 and 8.
To enable UPnP:
•Select Firewall with UPnP / Use UPnP to let DC++ configure my router.
If your UPnP system is setup correctly, DC++ will now automatically create the required port mappings for DC++ to operate in Active Mode. It will also detect your external IP address and switch into Active Mode.
Alternatively, to test your UPnP functionality, you can run the web based Internet Connectivity Evaluation Tool from Microsoft. This tool is avaliable only for Windows XP and Vista and requires IE6 or later to run.
If your router fails the UPnP test(s), then it's doubtful DC++ will function properly with UPnP either. If none of your network interfaces are reporting UPnP capabilities, try the following suggestions:
•Ensure Windows UPnP services (Control Panels -> Admin Tools -> Services) are running. "Universal Plug and Play Device Host" and "SSDP Discovery Service". Both of these XP services should be set to "Automatic" startup and "Started" status:
•Switch on the UPnP User Interface. To do this: Open "My Network Places", and in the Network Tasks Panel, select Show icons for networked UPnP devices.
If UPnP is working, you should see your routers name in My Network Places:
Also, when you go to: Start | Settings | Network Connections, you should see Internet Connection listed under the Internet Gateway category.
•Reboot both your PC and your UPnP device (router).
•If you do not see your router as a network device in "My Network Places" after several minutes, UPnPTest will fail to create an UPnP mapping to the router, resulting in something looking like: INFO: Adapter #0 - 192.168.8.17 - UPnP Disabled. Make sure the windows firewall or your third party firewall is not blocking UPnP packets.
Windows XP Firewall:
Go to Control Panels -> Windows Firewall -> Advanced Tab -> Security Logging -> Settings. Enable Log Dropped Packets. The log file is located at C:\WINDOWS\pfirewall.log If you see any packets being dropped with the port 1900 or 2869, the the firewall is misconfigured and is preventing UPnP from working.
For more tips about newer versions of Windows visit the DC++ firewall unblocking guide.
Third Party Firewall:
Checking this setting varies widely between firewalls. Most decent firewalls have some sort of logging function, where one can see what the firewall is blocking. Look for "UPnP" or ports 1900 and 2869 and refer the firewall's manual how to unblock.
•If the diagnostic tool is now still not reporting any UPnP devices, you should start considering more drastic actions like upgrading your router firmware, as many routers have UPnP implementation bugs.
If your router still fails the UPnP test follow the guide on Manual port forwarding to be able to use DC++ in active mode.
Initial content submitted by mgillespie
DC++ Change Log Related Entries: