This guide shows you how to reset your Dlink DSL-3900 router to factory default settings. This is not the same thing as rebooting a router. A reboot happens every time a router loses power. This is very different from a reset, which erases a router completely and returns it to factory default settings.
Warning: Before you proceed, there are a few things you need to know. When you reset your router, the following will happen.
- The router's login and password are reset.
- All WiFi settings are reset, including network name and password.
- All ISP settings will reset to default, and you may have to contact your ISP.
- Any port forwards, firewall settings, or parental controls that you have configured will be removed.
A router reset should be considered the last resort when you cannot log in to your router any other way. You should be sure that you have tried to at least recover your router password using our Router Password Finder before resorting to a router reset.
Other Dlink DSL-3900 Guides
Use a VPN Instead
Have you considered using a VPN instead of forwarding a port? For most users, a VPN is a much simpler and more secure choice than forwarding a port.
We use and recommend NordVPN because not only is it the fastest VPN, it includes a new feature called Meshnet that makes forwarding a port no longer necessary for most applications. With NordVPN Meshnet, you can connect to your devices from anywhere in the world, completely secure, over a highly encrypted VPN tunnel.
When shopping for a VPN, make sure that they meet the following criteria:
- Your VPN provider should have a no-logs policy. This means that they do not keep any logs of any kind.
- Make sure that your VPN provider has lots of exit nodes all around the world.
- Check that your VPN will not affect your speed.
- Verify that your VPN provider uses WireGuard as the underlying protocol.
- Many people prefer a VPN provider that is not based in the United States.
This is the list of requirements that we used when we were shopping around for a VPN provider. There are lots of free, shady VPN providers out there that we looked at and dismissed.
Based in Panama, using diskless servers, and with over 6,100 servers in 61 countries, we can safely say that NordVPN satisfies all of these requirements.
Once you've set up your NordVPN account on multiple computers and enabled Meshnet, you can seamlessly access all of your devices as if they were on the same network. You don't even have to log in to your router. It's very simple.
Every time you click on one of our affiliate links, such as NordVPN, we get a little kickback for introducing you to the service. Think of us as your VPN wingman.
This is the reset router guide for the Dlink DSL-3900 AU_1.00. We also have the following guides for the same router:
Recover Password in Dlink DSL-3900
If the only reason that you are resetting your router is because you forgot your router password, then you may want to try running our Router Password Finder instead of resetting your router.
Router Password Finder can save you a ton of time by recovering your lost or forgotten router password instead of doing a full router reset.
Router Password Finder - Automatically Recover Lost or Forgotten Router Passwords
Do not do a full router reset until after you have tried every other option to log in to your router.
Reset the Dlink DSL-3900
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Most of the time you can find a small reset button located on either the back or the bottom of a router. Look for something that looks like this:
Your reset button may look different, but usually they are very small. Sometimes the button is under a pinhole, and you need a paper clip to push it.
Keep an eye on the lights on the front of your router while holding the reset button down for about 10 seconds. After a few seconds the lights should blink differently. When this happens, the reset is complete. Keep holding the button as long as you want, it will not hurt anything to hold it down too long.
Remember, this will totally reset your Dlink DSL-3900 router.
Only do this once you have exhausted all other troubleshooting options, such as running our Router Password Finder software, which can recover a lost router password for you.
Login to the Dlink DSL-3900
Once the reset is complete, you need to login to your router using the default IP address, username, and password. You can follow the DSL-3900 Login Guide to find everything that you need to log in.
Change Your Password
After logging in, you should really change your router's password for added security. It's a very bad idea to leave your router's password set to the factory default. If you need help coming up with a strong password, check out our Choosing a Strong Password guide.
Tip: A great place to write your new password down is on a piece of paper taped to the bottom of your router.
Other Dlink DSL-3900 Guides
We have collected a lot of information about the Dlink DSL-3900 router. You can find some of our additional content here.
This is the reset router guide for the Dlink DSL-3900 AU_1.00. We also have the following guides for the same router: