Computer is able to connect to our domain network but not to the internet

[TeachGeek1]

We've recently had a powercut in the local area and been having numerous issues rising from it. Most have been fixed, however, one of the desktops is now refusing to connect to the internet. It connects to our domain server just fine through the ethernet ports and we can log into it using our staff and pupil accounts, however trying to open sims, the internet or anything wider than our domain brings up an ERR_NAME_NOT_RESOLVED. Just about to try and clear the cache and see if that works (will update if it does) but I'm not sure thats going to fix it.

[Davit2005]

Can you ping 8.8.8.8 from the troublesome computer, is the domain controller on the same network, has the PC got the correct IP info including default gateway, is sims local or the cloud?

 

Did the PC shutdown cleanly before the powercut?

Edited June 8, 2023 by Davit2005

[TeachGeek1]

Can't ping 8.8.8.8, domain controller is on the same network, not yet looked at the IP info, SIMS is local.

 

I've also tried flushing the dns, checking windows defender to see if thats causing any issues (not that we use it for our firewall). I'm fairly sure its to do with them computer specifically as the other machines in the room are all connecting just fine to the internet. It's just annoying as this specific one is the only one that uses SIMs.

[Davit2005]

Can you ping the devices default gateway?

 

First things would be basic tests.

 

Try connecting the PC to a different network port/switch, check IP settings and compare subnet mask, gateway and DNS.

 

I must admit ping isn't 100% reliable. You could look at doing the sfc /scannow on the PC. Also have you logged into the PC with a user that has not logged onto it before to make sure it is not using cached domain credentials?

[mavhc]

What's different about this PC from the one next to it?

 

Check with ipconfig /all:

IP address

Gateway

DHCP server

DNS server

 

ping each of those

 

Next check routing table:

route print

[howartp]

I'm going to throw this out there, as I had very similar situation with a PC in a community hall I manage last week.

 

Try disabling IPv6 in the properties of the network connection (start > run > ncpa.cpl)

 

The PC was working fine until I was about to setup remote access to it (I was onsite at the time, but it is headless in normal operation) when I lost all internet access. I've no idea what was going on but after several hours of playing, disabling IPv6 was one of two changes I made that brought it back; the other I think was coincidental.

 

Peter

[Sonic007]

Any proxy that is set on that machine?

 

Checked that the machine is set to DHCP and doesnt have a static IP?