Resetting the password for a Comcast Business Router

I needed to reset the password on a Cisco router provided by Comcast for Internet service for a local business, since I needed to update firewall rules in the router, but when I tried what I thought was the password it didn't work. The model number for the Cisco router was DPC3941B (the model number is on the bottom of the router). To reset the password, I followed the procedure below:
  1. Unbend an end of a paper clip and put it in the Reset hole, which is on the back of the router near the top of the router. Hold it in place for about 20 seconds. You may need to wait several minutes for the router to reset, but if you have a device plugged into the router that is configued to receive its IP information by DHCP, it should receive an address in the 10.1.10.x range, e.g., 10.1.10.250, after the router has rebooted.
  2. You should then be able to open a browser and go to http://10.1.10.1 and get the login page for the router.

    Admin Tool Login

  3. Use cusadmin for the username and highspeed for the password. Note: I've seen CantTouchThis listed on some websites as a possible alternative password.
  4. You will then see an "Are You Sure? window, stating "There are 10 remaining login attempts for remind me later option; after 10 attempts, you will be required to change your password." Click on OK to change the password.

    10 Remaining Logins

  5. You will be asked to retype the old password and to provide a new password. The new password must be a minimum of 8 characters with only alphanumeric characters allowed, i.e., only letters and numbers with no spaces between characters. The letters are case sensitive, i.e., if you enter an uppercase letter "A" here, a lowercase "a" won't match. When you have entered the passwords, click on the Save button to save the new password.

    Change Password

  6. Once you've changed the password, you will then be asked to login again using the new password.

If you need to reconfigure the subnet used by the router after resetting the password, see Change subnet for Comcast Business Router.