apostolakisl Posted March 29, 2019 Share Posted March 29, 2019 I have never heard of this. It has happened to me twice now. It has nothing to do with ISY except that it happens to be the PC I use most often to run the admin console. The PC has now twice in the past 6 weeks crashed, totally frozen up requiring hard reboot. That part is not so unique. But the unique part is that while crashed, it is killing the entire network. Nothing else on the LAN can communicate. In fact, other devices will even say they aren't connected to the network, not get an ip address or anything. It is like the PC is doing a DOS attack on my router, which is a ubiquiti usg. Simply unplugging the pc from the lan or rebooting it restores normal function of the lan. Any ideas here? Not sure if the offending pc has a software or hardware issue. Otherwise it is a good pc that before these last two crashes didn't ever crash that I can think of. Link to comment
jerlands Posted March 29, 2019 Share Posted March 29, 2019 You might try updating or reinstall the driver for the Ethernet LAN controller. I have a machine with a Qualcomm wifi chip that'll crash the computer if it switches from 5 to 2.4 GHz. Why your issue is affecting the entire network is puzzling but you seem to have it narrowed to that one machine anyway... Link to comment
simplextech Posted March 29, 2019 Share Posted March 29, 2019 Sounds like an old fashion broadcast storm causing the ports to "flap". Is the computer in question connected to a hub, switch or direct to your router? Link to comment
apostolakisl Posted March 30, 2019 Author Share Posted March 30, 2019 It is connected to a switch that is in a different building from the router. USG has two ports which are set up as two different LAN's. The main LAN port goes to a switch, one of the outputs goes to a fiber converter, which goes to building two, where it is converted back to ethernet and plugs into a switch there. The computer in question is plugged into this switch. Everything on that LAN in both buildings is jammed. The second LAN port on the USG I have set up as a different LAN (it just does the voip phones). That LAN isn't affected (the phones work). Link to comment
simplextech Posted March 30, 2019 Share Posted March 30, 2019 Yeah something up with the NIC in that system. You could probably VLAN it but probably more work than you want to do just for one bad system. Link to comment
larryllix Posted March 30, 2019 Share Posted March 30, 2019 Do you have a good and updated virus scanner. Almost sounds like a DoS contributing app. Link to comment
apostolakisl Posted March 30, 2019 Author Share Posted March 30, 2019 10 hours ago, larryllix said: Do you have a good and updated virus scanner. Almost sounds like a DoS contributing app. I don't think so. It would have to be simulating a frozen computer while running the dos attack. I'm not familiar with any virus that can make a computer not respond to ctrl-alt-delete but yet have the computer still running the virus code. Anyway, the computer yesterday started showing some signs of a hardware issue. It is not recognizing all the ram now. Link to comment
larryllix Posted March 31, 2019 Share Posted March 31, 2019 14 hours ago, apostolakisl said: I don't think so. It would have to be simulating a frozen computer while running the dos attack. I'm not familiar with any virus that can make a computer not respond to ctrl-alt-delete but yet have the computer still running the virus code. Anyway, the computer yesterday started showing some signs of a hardware issue. It is not recognizing all the ram now. Well good you are finding it. Not good you are having hardware problems. A few bucks can be worth the end to the agro though. Good luck!! Link to comment
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