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1) First, try this (order is important):
1.A) Ensure that your TCP/IP settings match Comcast's recommendations.
1.B) (Optional but highly recommended) Uninstall (just disabling them doesn't always work) all installed software firewalls.
1.C) Shut down your PC.
1.D) Connect the cable modem directly to the PC. (Not though a firewall, hub, router, switch, etc.)
1.D.1) Unplug (from power) all 2.4GHz wireless equipment within 25 feet of your cable modem. In certain circumstances, these devices will create interference that the cable modem will try to interpret as signal.
1.E) Reset your cable modem. (Sometimes there is a reset button or hole, sometimes it is simply a matter of unplugging the cable modem from your power outlet, waiting about 2 minutes, and plugging it back in.)
1.F) Wait for your cable modem to regain block sync.
1.G) After the cable modem has regained block sync, boot your PC back up.
1.H.1) (For users of Windows 98 to Windows Millenium) --NOTE-- Be -very- careful what you do in msconfig, as it has an extremely high danger potential. As a last resort with Windows 98, 98SE, and Windows Millenium (ME), you can try running 'msconfig' from a 'Run...' prompt and unchecking the 'Startup Items' check box followed by a reboot. Be aware that doing this will very likely disable any anti-virus software and/or firewall software you have installed. --NOTE-- Be -very- careful what you do in msconfig, as it has an extremely high danger potential.
1.H.2) (For users of Macintosh OSes prior to OSX) A similar option (once again a last resort) for Macintoshes running Mac OSes prior to OSX is to open the 'Extension Manager' control panel and select the 'Base' set from the pulldown menu at the top of the window.
Problem gone? Great! You saved yourself hold times, waiting for a service call, paying a trouble call fee, etc.
2) Next, if you have another PC, try connecting the modem directly to it. If your problems go away, guess what? Your original PC needs some configuration help. Try following the suggestions given elsewhere in the Comcast FAQs. This is redundant, but repeat this step if you have any more PCs that you can try.
*This FAQ is based on user knowledge from a volunteer core of BroadbandReports' members. This FAQ in no way constitutes official information from Comcast or any of its affiliates.
Basically this is what we do when customer has issues with HSD. Also, if all of that fails, try: netsh winsock reset (you'll need to log in as administrator in Windows Vista and 7). This resets the TCP/IP conection. Then, restart your PC.