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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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    1) Directly connect to your modem via ethernet.  Restart your modem everytime you plug in a new device. It's a good time to replace your Ethernet cables; Cat6 preferred. If your speeds are good, concentrate on router/networking issues. If the speeds are still poor, concentrate on modem/signal issues. Do not test speeds over WiFi. 2) Test your speeds on Xfinity's network. Use   http://speedtest.xfinity.com/   as your primary speed test. This means you'll be testing on Xfinity's network exclusively. This eliminates routing or internet congestion as potential problem sources. 3) Verify that your modem is approved for gigabit speeds See   Approved Xfinity modems and gateways. Or   My Device Info. 4) Verify that your modem is provisioned for gigabit speeds.  To find your speed tier v isit My Device Info . After you log into your account, your speed tier will be displayed on the left-hand side of your screen. Alternatively, you can   view the speed tier to which you are subscribed here . Sign in and scroll down to the data usage graph area. If your modem displays a bootfile it should look something like this: d11_m_xxx_gigabit_c01.cm 5) Verify that you have 10/100/1000 (Gigabit) network adapters.  No USB adapters. Verify that the adapter is set for Gigabit speeds, full duplex. 6) Verify that you meet the minimum system requirements.   Xfinity Internet Minimum System Requirements   -   For Speeds up to 1 Gigabit per second Operating System Windows 10 (64 bit) or newer or Mac   OSX   10.8 or newer. Visit the   Microsoft Windows lifecycle fact sheet or   Mac OS X Support overview   for their latest operating system information. Browser Google Chrome 56.0.2924, Microsoft Edge (64-bit), Mozilla Firefox 52 (64-bit) or Safari 8 or newer. For more information about different browsers or to download a new one, visit   whatbrowser.org. Ethernet Cable Cat5e or Cat6 Ethernet cable. Note:   Due to Ethernet overhead, actual download speeds are limited to 940 Mbps over a hardwired connection. Ethernet 10/100/1000 Gigabit Ethernet interface or adapter for wired connection CPU/Processor Intel Dual Core i5 or better or AMD Ryzen 5 or better Memory 8 GB of RAM minimum Hard Drive / Space 64 GB or larger SSD recommended to achieve maximum download speeds   7) Make sure your signal levels meet specifications. See   the troubleshooting guide. And/or watch a how-to video. The video is also available at the bottom of this post.  8) Turn off security software briefly and test speeds. Antivirus and malware software can significantly impact speeds if they are too restrictive. Do not run multiple antivirus programs. Your operating system may also have overly restrictive security settings. 9) Boot into safe mode with networking and test speeds. If your speeds are good, concentrate on software issues. If your speeds are poor, concentrate on hardware issues. For   Windows 10:  Restart your PC. When you get to the sign-in screen, hold the Shift key down while you select Power   > Restart. After your PC restarts to the Choose an option screen, select Troubleshoot > Advanced options > Startup Settings > Restart. After your PC restarts, you'll see a list of options. Select  5 or F5 for Safe Mode with Networking. To load your   Mac   in Safe Mode (aka Safe Boot), press and hold the   Shift   key while it boots. You can stop holding the   Shift   key when you see an Apple logo and progress bar. To leave Safe Mode, just reboot your Mac. 10) Ask for help on the forums. The community will often be able to offer you sage advice. An employee can check your modem/node health and review current and historical reports related to your modem.  11) Request a tech visit. If all else fails, schedule a tech visit. Techs have specialized testing equipment such as the XMT, an ODROID-based device designed specifically to test speeds.  They can determine definitively if it's an Xfinity issue or a wiring/home networking issue.  
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 I am sure that people will run into this.  On the canon image CLASS MF8300C also known as mf8380cdw, it took me some time to figure out how to get scan to email working.  Summary is to change the SMTP port to 587 and use your smtp auth set to your Comcast login.  The default port 25 won't work and port 465 won't work.   Here is how:   configure the management name/pin. login as management to the the web UI browser, http://printer-ip/ change the SMTP TX port to 587, find it at System Settings -> Network Settings -> TCP/IP Settings -> Port Number Settings Enter the info in E-Mails Settings System Settings -> Network Settings -> E-Mail Setting SMTP Server Addess: smtp.comcast.net E-Mail Address: your@address Check Use SMTP Auth Enter your username: your@comcast.net Check Set/Change Password Password: Your password.      5. Instruction says to power cycle for the new settings, do it.   Good Luck!
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How to find a compatible modem with your Xfinity Internet service
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This article provides you with some tips for troubleshooting your XFINITY Internet connection
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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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This article provides information and links if you  think your computer is infected.
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This article helps explains how to tell when a "Comcast" email is real or fraud
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Activating an Xfinity Wireless Gateway This article guides you through the steps to install and activate your Xfinity Gateway. If you are replacing a device that is currently installed in your home, be sure to disconnect that device before following the steps below. Place Your Gateway Find the cable and power outlets most centrally located in your home. Place your Gateway off of the floor and in an open area away from exterior walls, metal surfaces, microwaves, and windows. Avoid cramped spaces and anything that can block the device from broadcasting freely.   Plug in Your Gateway Plug the power cord into your Gateway and then into an electrical outlet. Screw one end of the coaxial cable into the Cable In/RF In port on your Gateway and the other end into the cable wall outlet. Make sure the connections are finger tight. If you subscribe to Xfinity Voice service, connect your telephone to the   Tel 1   connection on your Gateway using a telephone cord.   Wait for Your Gateway to be Ready Your Gateway may reboot, and it could take up to 20 minutes for it to be ready to activate. Make sure the lights appear as described below before moving on to the next step. Do not unplug your Gateway during this process. If your Gateway has multiple lights on the front, the   Power,   US/DS, and   Online   lights should remain solid for at least one minute and the   WiFi   light(s) should start blinking. If your Gateway has only one light, it should remain solid white for at least a minute.   Establish a Temporary Internet Connection to Activate If you prefer to use a smartphone, tablet, or laptop with WiFi connection: Look for the Network Name (SSID) and Password printed on the side, back, or bottom of your Gateway (the name should look like Home-XXXX or XFSETUP-XXXX). Select the name from the list of available networks on your WiFi-enabled device and enter the password when prompted. If you're prompted to enter a PIN instead of a password, click the   Connect Using a Security Key   link to enter the password found on the Gateway. If you prefer to use an Ethernet connection: Plug the Ethernet cable into one of the open ports on your Gateway until it clicks. Plug the other end into the Ethernet port of your computer. The Ethernet port will light up when successfully connected.   Activate Your Gateway Once you've established a temporary Internet connection, if you're not automatically presented with a welcome message to begin setup, open a web browser and navigate to   xfinity.com/activate. Follow the on-screen prompts to verify your Xfinity account and complete the activation process. When you've finished activation, your Gateway may reboot. It may take up to 10 minutes after activation before you can connect to your home network.   Connect to Your Home Network After the Gateway has been activated and after a possible reboot, you may need to connect your devices to your home network if you changed the network name and password. Go to the WiFi settings on your WiFi-enabled devices (e.g., smartphone, smart TV, laptop). Select your home network WiFi name and connect with the password. If you changed this during or after activation, be sure to use the new one you set up. Note:   The Xfinity WiFi home hotspot may take up to 24 hours to broadcast. For more information, please see   Questions about the Xfinity WiFi Home Hotspot.     If you're activating an Xfinity xFi Gateway (models Arris 1682G, Cisco 3941T, Technicolor CGM4140COM, or Arris TG3482G), you can use the steps below or download the Xfinity xFi app on the Apple App Store or on Google Play for an easy, guided setup process. To determine the type of Gateway you have, check the make and model information located on the bottom of your device. You can also check this information in  My Account .     Activating an XFINITY xFi Gateway with the XFINITY xFi App   Activation Instructions 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.   First, we'll need to identify your Gateway. 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 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 part of the process can take up to 10 minutes to complete, during which time you will see status updates at the top of the screen. 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.   **NOTE**: Remember, you'll need to connect all of your WiFi-enabled devices using the WiFi name and password you created.
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How to turn Bridge Mode on and off on Xfinity modem
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Congressional Review Act (CRA) Bill- Comcast Consumer Privacy
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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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Once you have WiFi in your home, you’ll want to make sure you’re getting the most out of your connection. Older equipment and poor network configuration can slow down the speed of your WiFi connection in your home, which could lead to slower downloads, lagging online games and streaming video, and overall slower Internet performance. What else can impact the speed or performance of your network? Number of WiFi devices on your home network Interference from neighboring WiFi networks Limitations of individual WiFi devices Distance between the wireless gateway and your WiFi-enabled device (i.e. mobile phone, tablets, laptop, etc.) Physical factors (i.e. home construction, apartment vs. single home) Here are a few ways to improve your WiFi network. Wireless Gateway Placement The placement and location of your wireless gateway can affect the WiFi radio signal strength and speed of your connection. For best WiFi coverage, ensure your wireless gateway is elevated (off of the floor) and in an upright position. Place your wireless gateway in a central area where you’ll most commonly use your WiFi devices. In general, an open space is better than a crowded space.   Minimize Interference For the best WiFi reception and the least interference from nearby wireless networks, place your wireless gateway in an open area, away from: Walls Furniture Metal surfaces (including computer cases) Halogen/fluorescent lighting Microwaves and refrigerators TVs and computer monitors Cordless phones (excluding DECT or 900MHz models) Baby monitors Large amounts of water (like aquariums and water heaters) Keep in mind that the WiFi-capable devices you connect to your in-home network play as important a role as the wireless gateway when it comes to range and speed issues. Additionally, locations that tend to have high WiFi usage, such as crowded neighborhoods and apartments, may affect your speeds, especially during peak hours.   Other Considerations If you use a separate router along with the wireless gateway, make sure the wireless gateway is in bridge mode. (See   Enable or Disable Bridge Mode on a Wireless Gateway.) To find out more about wireless networking, please see   What is WiFi?   to find out what WiFi is and how it works. For information on home networking and how to set up a home network, see   What is Home Networking?   Upgrading Your Modem Comcast provides several levels of Internet service offering different speeds, such as Performance, Blast! and Extreme 105 or Extreme 150. Your level of service is listed on your billing statement. Because some older modems and gateways can’t adequately support higher levels of Internet service, you may still be accessing the Internet at slower speeds, even if you’ve upgraded your plan. If you lease a modem/gateway from Comcast, you’ll want to upgrade your modem/gateway to make sure you’re getting the fastest network speeds possible. You can find a list of Comcast-approved modems and their specifications at the   DOCSIS Device Information Center. To find out more about upgrading your equipment, see   Upgrade Your Wireless Network Equipment.   For more information, see https://customer.xfinity.com/help-and-support/internet/improve-your-wireless-home-network/
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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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Please 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 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, 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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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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  For those of you who have an anti-virus/security program/suite installed on your system, it is important to remove those programs prior to installing NSS.  It is recommended that the programs first be removed via Control Panel > Add/Remove Programs.  Once the program is removed, do a search for a Removal Tool for that program.  Many programs have removal tools available and insure a more thorough removal of the old program and a better chance of a clean install of NSS.   Here is a suggested link to assist with the removal: http://support.kaspersky.com/us/consumer/tools-utilities?_ga=1.54697835.1371605271.1460378651   Insure your Windows Firewall is turned on.   Turn off all your remaining anti-malware tools (except Windows Firewall) and reboot.   The Norton Security Suite,is available only for Comcast High Speed Internet customers.  You can go to the “Get Comcast Norton”  page   http://constantguard.comcast.net/norton?cid=NET_33_601 and confirm each of the prerequisites listed there and the minimum system requirements on subsequent pages. You may be required to logon with a Comcast.net Identifier that you use for Comcast Email or for this Forum before you download.   Please follow the instructions for installation and view the video for more clarification.   Once installation is complete, open NSS and manually Run LiveUpdate (located on drop-down under PC Security 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.   If any problems/questions feel free to start a new thread on the Anti-Virus Software & Internet Security Board and we'll provide assistance.
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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 disable the XFINITY WiFi Hotspots on your Comcast modem
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