Hi guys,
today i’m experiencing a strange beahvior, i have a website(hosted by a third party hoster), that:
-is fully accessible by 3g/4g mobile connection;
-is fully accesible by some of my pcs in lan
-is not accessible by the others in the same lan.
The os version varies from windows 13.1 to 13.2.
The first time i’ve thought that should be a dns related problem, so i’ve flushed dns cache with sudo service nscd restart or sudo nscd -i hosts. For a day or two it worked.
Then with nslookup command i’ve tried to resolve the ip address and paste it in the browser, no luck.
Maybe the proxy? no proxy enabled.
Firewall? For test purposes i’ve deactivated it at all.
Still no luck.
Neither accessing with another user profile (directly root), seems to solve.
What should be?
Is there a diagnostic tool to check what happens when the site is trying to load?
Firefox with it’s debug tools shows me only the GET method and nothing else.
A proxy cache might be relevant only if a proxy actually exists somewhere (and likely affecting only the specific non-accessing machines).
Start with any errors which might be displayed or in a log. You’ll likely see some kind of 400 series error, but you might get something else.
A basic troubleshooting starting point… Is there anything in common with those machines? Are they topographically related? Are they using a different web browser than others?
If you can’t determine some kind of group relationship, <then> start looking at individual machines.
Use nslookup as you’ve described to determine if name resolution is a problem.
Flush your local name resolution cache by stopping and starting your name service cache daemon if you have a name resolution problem.
It’s hard to propose a specific solution until you are able to get a specific error code.
If you have even passing coding skills, you can invoke the “Developer Tools” which exists in every browser (except earlier Windows Internet Explorer), usually by CTL-SHFT-J (but might vary a bit on some browsers). If you have that pane open, a trace is performed when you go to a web page.
Thanks to all,
i solved by making a phone call to my ISP, they had a bad configuration but they didn’t explain me much more.
It sounds strange but in fact my machines are always of the same, because no one have the rights to do anything than explore the web, and printing documents!lol! So absolutely it’s not our fault.