Internet access limited to a single device after activation with Xfinity.
Internet access limited to a single device after activation with Xfinity.
I tried my old modem for about 20 minutes, and then all my other devices connected to the nighthawk S8000 switch started working smoothly. It’s been a while since I used the newer CM1000 modem, but my current model is an SB6580 that’s been around 5+ years. I’m planning to test the new one again and wait an hour to see if things work as expected.
I performed a full reset and removed the Ethernet from Computer A, which was already operational. I then linked it to Computer B, and it started functioning while Computer A stopped accessing the internet. I attempted another reset—disconnecting the Ethernet and coaxial cable, holding the reset for 20-30 seconds, reconnecting the coaxial line and letting it stabilize before reattaching the Ethernet—and finally connected only to my router, but no internet access was achieved.
It usually occurs when taking out the Ethernet connection from a device that uses only wired networking. Have you got another router available for testing to check if the issue persists?
RMA that issue... It seems there might be a problem with the modem itself. Or maybe the NIC card in computer B isn't working. You should try using the modem's Wi-Fi with your cell phone. If it doesn't work, you'll see it won't have an IP address listed under "about phone" or "network" in the settings. This could help confirm if the modem is the issue.
I reconnected it later to attempt another try after checking the second machine. I'm not claiming the Ethernet cable was unplugged or the device stopped working, just that it didn't work anymore. Even with Ethernet from the modem to an Ethernet switch linked to several devices, only the device used to activate the Xfinity service got internet access. What I meant is that I tested it with CompA and CompB. When I enabled the service via CompA, I attempted to connect CompB to the Ethernet port, but neither connection provided internet—even when both were hardwired through the same modem via a switch. The router itself isn't getting internet. I own three modems: an Xfinity model, an Arris SB8200, and an older Arris 6580 (limited to 280 download).
Thanks for your response. Both CompA and CompB seem to function well online. CompB even offers two Ethernet ports, which helps with troubleshooting if needed. I've talked with everyone on CompB so far. Recently, my old Arris 6580 managed to get everything up after about 20-35 minutes, which was a relief. I thought maybe it was finally working, so I reinserted the 8200 modem. Now I'm seeing a new error: "Sorry, we can't find this device." I contacted a T1 technician, a supervisor, and an advanced network specialist, and they suggested taking the modem to an Xfinity store for scanning and account assignment. After hours of troubleshooting, the system removed the modem entirely. This is the second modem in two days, with different models but the same issue. I believe there might be a problem with their system taking too long to recognize it fully. I hope things will improve soon.
It's fine, no misunderstanding. I own the Nighthawk S8000 Smart Managed Plus Gaming Switch. At one point I had internet access on all my devices via that device while connected to my 5-year-old 6580 router, but it was only D3.0. My new 8200 supports D3.1 and has a gigabit connection, though the 3.0 version only reaches up to 280-300 down and 5 up. Right now I'm using the xfinity modem until later today when I can visit the store to have them scan my 8200 and get everything working, hopefully.