Website won't come up for only one PC at work

[Moose1309]

DNS configuration is fine. Connectivity is fine. I have a feeling this is something simple, but it's really puzzling.

I noticed earlier today that certain websites wouldn't come up on my PC. I thought, they must just be getting hammered. Then someone called me and said they can't get to a website they use all the time. It was working earlier today, and suddenly won't come up. Browser says "waiting for server.domain.net" indefinitely. This PC can visit any other site I've tried. Aforementioned site comes up on other PCs. Site resolves to the same address on all PCs, and they all use the same DNS server etc.

😕

 

[Zap]

From the afflicted machine, see if you can ping the address from a command window. Try pinging it from a "working" machine. If it doesn't ping or pings a different address, then afflicted machine can have an internal DNS issue or it can have malware. If it pings fine but doesn't browse, then maybe a malware issue or broken browser. Maybe someone accidentally clicked something in a software firewall on that PC? Can try flushing DNS on the afflicted machine, IIRC command line:

ipconfig /flushdns

Take a peek into the hosts file to make sure that domain isn't listed in there. Location varies based on OS version, but is often found:

c:\windows\system32\drivers\etc\

 

[Moose1309]

Good suggestions, all of which I tried except pinging, which I didn't think of for some reason. nslookup returned the same address from working PC as with not-working one. No malware on the PC. I tried an hour later and viola, it was working again. I think this is just an issue with our service, or internet router not keeping track of all the sessions.