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This article provides information and links if you  think your computer is infected.
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How to find a compatible modem with your Xfinity Internet service
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  This article outlines how to activate your Xfinity Internet/Xfinity Voice service if you rent an Xfinity xFi Gateway (Arris 1682G, Cisco 3941T, Arris 3482G, Technicolor CGM4140COM or Cisco DPC3939). To determine the type of Gateway you have, check the make and model information located on the bottom of your device. You can also log in to  My Account  and select  Devices  to view the make and model of your Gateway.   If you do not have an xFi-compatible Gateway, please see the activation instructions for other Wireless Gateway devices.       Activation Instructions Before you start: Download the Xfinity xFi app for free from the Apple App Store or Google Play. Launch the Xfinity xFi app and sign in using your Xfinity username and password. (You must be the primary or an unrestricted secondary user to access.) Select   I'm setting up my Wireless Gateway. After activation you can continue to use the Xfinity xFi app to manage your home network. Select   Get Started   to begin the process of setting up your Gateway. The entire process should not take longer than 20 minutes.   Select   Use Camera   to scan the QR code on the side or back of the device. The QR code should contain all of the information needed to begin activation. You may also be prompted to grant the Xfinity xFi app permission to access your smartphone's camera.   Note:   If your device does not have a QR code to scan, you will need to enter the 12-digit CM MAC number found on the side or back of the Gateway. Select   Enter Code Manually   and follow the on-screen prompts. You may also be prompted to enter the CM MAC number even if your device has a QR code if we need additional information. Your smartphone's camera will open within the Xfinity xFi app. Find the QR code and focus the camera on it. Once the QR code has been successfully scanned, you will see a green check mark. Note:   Keep your smartphone as steady as possible. If the camera has trouble focusing on the QR code, try slowly moving your smartphone away from and towards the QR code. The app will then take you through the necessary steps to set up your Gateway (modem/router) and activate your Xfinity Internet/Xfinity Voice service. For the best WiFi coverage, set up the device in the most centrally located place in your home where there is also a cable outlet. Also, avoid placing the device in your basement or attic as this can interfere with your WiFi signal. Keep it out of cabinets or closets, and make sure it is off of the floor. Select   Next   to proceed through these tips. Once you've found the best spot for your Gateway, follow the instructions to connect the coaxial cable and power cord. The lights on the front of your Gateway will flash and blink as the device prepares for activation. Select   Ready to Go!   to continue.   Now that your Gateway is connected, it's time to personalize your home WiFi network name and password. Enter a WiFi name and password that is easy to remember and secure. Select   Next. Confirm the WiFi name and password you entered are correct. If you need to make changes, simply select the back arrow in the top left-hand corner of the screen. If you are also activating Xfinity Voice, you will see your phone number on this screen. Select   Confirm and Finish Up. Note:   For customers swapping an existing xFi Gateway with a new one, you may be presented with the WiFi name and password associated with your previous device. You can choose to keep them the same, or create a new WiFi name and password. If you change the name/password, you'll need to reconnect all your devices using the new information. Your home network setup will now begin. This can take up to 10 minutes to complete. You will also be prompted to enable push notifications to be alerted when activation is complete. Once your Gateway is activated and your WiFi is ready to go, you'll be presented with instructions on how to connect to your new WiFi network. Two shortcuts are provided to make this process even easier. Simply copy your WiFi password to your clipboard by selecting   Copy   and then   Go to Settings. From there, go to the WiFi settings on your device, wait for your new WiFi name to show in the list of available networks, join the network and then paste your password to connect. Remember, you'll need to connect all of your WiFi-enabled devices using the WiFi name and password you created. Select   Continue to XFINITY xFi   to access home network personalization and control features, for example the ability to see who's most active on your network, troubleshoot any connection issues, and block inappropriate content and network threats. To learn more about xFi features, see the   overview for Xfinity xFi Web Portal and Mobile App.
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How to turn Bridge Mode on and off on Xfinity modem
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How to connect to an Xfinity WiFi Hotspot
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In order to keep your Wifi network secure you may need to change your Xfinity Wifi password. Here are a couple of different ways to get that completed. 
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***Created by our Community Experts***     EXPORT   Identity Safe Data If you use Identity Safe, before you uninstall NSS you will want to go into Settings > Identity Protection > Log into Identity Safe by clicking on Configure (if not already logged-in) You will be interested in the Export Data option - you can click on Configure and will be permitted to browse your system for a location to save the data to.  You can create an Identity Safe BU folder in my Documents or on your desktop - but the choice of location is yours.  Select a location you will remember.   IMPORT   Identity Safe Data. Once NSS is installed, go back to the Identity Protection Settings page (above) and Select Import Data by clicking configure.  If you set a password when you saved the data, enter that password, the location of where you saved the data and then click OK.  Your Identity Safe data should be restored to what you had before you uninstalled Norton.
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***Created by our Community Experts***     **Note**:  These instructions should also be followed if changing from one Norton product to another. ie a paid/trial subscription from Norton to the Comcast version, or a version upgrade of NSS which is more than one upgrade old.   If you use Identity Safe, backup your Identity Safe data (See Export instructions here-   http://forums.comcast.net/t5/Security-and-Anti-Virus/How-to-Export-Import-NSS-Identity-Safe-Data/m-p...     Uninstall NSS via normal removal procedures. (Add/Remove programs )   After it is uninstalled, run the Norton Remove and Reinstall Tool following the instructions here:  http://us.norton.com/support/kb/web_view.jsp?wv_type=public_web&selected_nav=partner&pvid=&docurl=20...   After running the Removal Tool, reboot, and download and install a fresh copy of NSS from here:  http://constantguard.comcast.net/norton?cid=NET_33_601   Once the installation is complete, open NSS and manually Run LiveUpdate (located on drop-down under PC Security on the left side of the main page of NSS) as many times as necessary for it to respond "no more updates available". If a reboot is requested, reboot and then continue to Run LiveUpdate until it responds "no more updates available" and then reboot one last time.  Your installation should now be up to date definition wise and ready for use.   After installation and update, complete the Import portion of the instructions here for Identity Safe Data here -   http://forums.comcast.net/t5/Security-and-Anti-Virus/How-to-Export-Import-NSS-Identity-Safe-Data/m-p...
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***Created by our Community Experts***     If you use Identity Safe, backup your Identity Safe data See Export instructions here  http://forums.comcast.net/t5/Security-and-Anti-Virus/How-to-Export-Import-NSS-Identity-Safe-Data/m-p...     Uninstall NSS via normal removal procedures. (Add/Remove programs ) Please Note:  During the uninstall of NSS, you should select the top option "I plan to reinstall a Norton Product in the future.  Please leave my settings behind."  The reason for the backup (Export/Import of ID Safe data) is a safety factor.     Follow the instructions found here:  http://constantguard.comcast.net/norton?cid=NET_33_601 to download and install a fresh copy of NSS.   Once installation is complete, open NSS and manually Run LiveUpdate (located on drop-down under PC Security on left side of main page of NSS) as many times as necessary for it to respond "no more updates available". If a reboot is requested, reboot and then continue to Run LiveUpdate until it responds "no more updates available" and then reboot one last time.  Your installation should now be up to date definition wise and ready for use.   After installation and update,if your Identity Safe data was not reinstalled, complete the Import portion of the instructions here for Identity Safe Data   http://forums.comcast.net/t5/Security-and-Anti-Virus/How-to-Export-Import-NSS-Identity-Safe-Data/m-p...
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Directions on how to initially install Norton Security Suite
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This article provides detailed information about Comcast provided Wireless Gateways and their features. 
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This article will explain what port forwarding is and how to use it on your in-home network. 
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How do I log into my XFINITY modem so I can manage my home network?
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This article explains how to clear your Internet browser history on Safari, Internet Explorer, Firefox, Chrome, and EDGE
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This article provides information on how to complete your XFINITY Wireless Gateway Self Install and Activation
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This article tells you how to troubleshoot your WiFi Network using XFINITY xFi
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Details on the personalization and control features available with Xfinity xFi.
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If you want to give other members of your household access to your master Xfinity account, you can create up to six distinct usernames online. By adding a user, you allow him or her access to manage your Xfinity services (billing, account information, etc.) and access your subscriptions such as X1 TV viewing. You can adjust individual permissions. Each account user must reside at the premises where the Xfinity services are provided.      Add or Invite a New User to Your Account Sign in to   My Account   as the primary user. Click or touch the   Users   tab at the top of the page. Underneath the current user portals, select the option to   Add a New User. Select the   Create credentials   option and click   Continue. Alternately, choose   Send email invitation   and follow the instructions below. Fill out the form with the new user's details, including their first and last name, a unique username and a password. Click or touch   Continue. **Note**:   Passwords must be 8-16 characters with no spaces and contain at least one letter and one number or special character. Keep billing permissions toggled to   Off   to grant basic account access. Toggle billing permissions to   On   to allow the new user access to view, manage and pay your bill. After making a selection, click   Continue. Set up a secret question and answer for username/password recovery purposes, and then click   Create Account. A confirmation message will appear, showing you the newly added user along with their username and newly created email address.     Invite a New User to Your Account via Email In addition to creating an account for the new user, you can add a new username via an email invitation, which will allow the user to create their own Xfinity account. Sign into   My Account   as the primary user. Click the   Users   tab at the top of the page. Underneath the list of current users, click   Add A New User. Select   Send email invitation   and click or touch   Continue. Fill out the form with the new user's details, including their first and last name and email address. Click or touch   Continue. Select one of the verification methods (either text message or service address ZIP code) and click   Continue. This will be used by the invited user to confirm their identity. To give the new user permission to view, manage or pay your bill, toggle billing permissions to   On   and click   Invite User. A confirmation message will appear, and the new user will receive an email invitation to create their account. Next, the new user will need to accept their invitation via text message or by entering the household's ZIP code. **Note**:   After entering their mobile phone number, the new user will have 15 minutes to enter the verification code that they received via text message. Once the invited user confirms their account by text or by entering their ZIP code, they will be prompted to set up their username, password and password recovery method. Once the forms are completed, the new user account will be created. **Note**:   If no action is taken within 72 hours of the invitation being sent, the primary user of the account must make a new invitation request.        How to Suspend or Remove a User - My Account Help Removing an Xfinity ID   permanently deletes a secondary user’s Xfinity ID, and all settings and preferences for this user will be erased. When you remove a secondary ID, you'll likely lose emails, voicemails, and other information associated with the ID. Be sure to print or save copies of anything you want to keep. If the ID is linked to more than one account, it will not be deleted, and will just lose access to the account it was removed from. Note:   If this ID has made scheduled payments, those will need to be cancelled prior to removing the ID. Only primary users can remove an Xfinity ID. Xfinity xFi users can also manage access through   xFi Parental Controls.     To Remove a Secondary ID Sign into   My Account   as the primary user. Click the   Users   tab.   Locate the user you wish to remove, then click   Edit   to the right of their name. Click   Remove   to permanently delete the ID from your account.   You'll be asked to confirm if you want to remove the user. To confirm removing the selected user, click   Remove User.     Additional Resources: Learn more about How to Add and Invite Users to Your Xfinity Subscriber Account Learn more about How to Suspend or Remove a Secondary User 
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This article explains how to disable the XFINITY WiFi Hotspots on your Comcast modem
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 I have no Internet access and  the US and DS buttons on the modem are blinking. How do I solve this?
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