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Here's a puzzle.
Last year I bought some hosting from a hosting company and pointed a number of domains that I own to run from this service. All domains working fine and publicly accessible.
Then a few months ago I was at home and realised that I could not view any of the sites. The browser would report an error. I assumed a temporary glitch. Back in the office, from my office machine and network, all the sites worked just fine. Back at home that same day, none of the sites worked. I tried multiple browsers on the same home machine, clearing the caches, restarting the machines, restarting the router, tried other machines on my home network, even tried an iPod - not a sausage. None of the sites would load. However, when I tried accessing them from my Blackberry I could see they were all working.
A few weeks ago, the sites started working again from home ... but then a day later had stopped! And that is the current situation. I cannot access the sites from home but they work from the office and indeed seem to work for any other user. One of the sites is for a local sports club - Godalming Badminton Club - try it yourself. If you have any problem let me know but I tried it just now from the office and it works and I am told by other users it has been working consistently over this period.
So it would appear that there is some problem with my local network or ISP. I use a cable connection from Virgin Media, connected to a Dlink DIR655 router/gateway/switch. I use OpenDNS instead of the default ISP DNS but that is one thing I have checked. I tried reverting to the default ISP DNS but it made no difference.
I used to think I was pretty savvy about this kind of this kind of thing but now I think I may have missed something obvious. Please could somebody suggest some steps to diagnose the source of this problem and/or tell me how to fix it!!
I think this belongs to webapps. – Michael K – 2012-03-30T08:17:03.877
@Michael K: Webapps is for questions about web apps (Gmail, Google, Facebook, Blogger, Flickr, Twitter, etc.). This question is about networking. It might belong on Serverfault, but the problem seems more home networking related than server/network administration related. So Superuser would be the best place for it. – Lèse majesté – 2012-03-30T08:31:44.877
@Lèse majesté you may be right with this, without knowing what causes the problem it is a bit hard to categorize. If it is a problem with the cms of the site, it would belong on webapps, right? – Michael K – 2012-03-30T08:35:28.603
@Bish I can access the page without any problems. I recommend you to check you home network and try to trace the way to the site (tracert on windows...) – Michael K – 2012-03-30T08:35:43.127
@Michael K: It could be. A more detailed description of the error is required. – Lèse majesté – 2012-03-30T08:39:24.170
@Michael I have not tried tracert. I will try that tonight to see if it reveals anything. The browsers return the sanitised messages (Chrome: Oops the page ...)(IE: The site may be down, network connection borken ...). Actually, does anybody know how you can see the http return code? – Bish – 2012-03-30T08:43:13.633
@Bish as far as I know, this error point out that the server could not be found. I'd say, there is something blocked or not correctly handled by you dns or your firewall. – Michael K – 2012-03-30T08:46:46.623