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The wifi/broadband in my house is failing to load certain sites (nothing dodgy, mainstream ones like bbc.co.uk, skysports.co.uk, so it can't be my ISP attempting some weird blocking). These are inaccessible across multiple devices (iPhone, iPad, Android phone, Windows7 desktop) so it's definitely not a device issue.

Error messages across all browsers/devices are general timeout ones. It appeared to be only .co.uk sites but I am able to connect to others like theregister.co.uk so it's not all of them. When I switch off wifi on my phone and try access sites over mobile data connection it loads them fine, so I know the sites aren't down.

I've rebooted router and also tried changing DNS to both GoogleDNS and OpenDNS without joy.

Any ideas? Anything else I could try? Am I missing something glaringly obvious?

KrustyGString
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3 Answers3

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I used to have to access xkcd.org instead of xkcd.com for a while with my D-Link Router. The first thing I did was reboot it; it would load once and that's it. I then looked on their website and found a firmware update. I backed up my Router settings and installed the firmware, and it seemed to have worked! So maybe give that a try, and make sure when you try it, you are connecting via ethernet, not wireless.

Finally, have you tried doing a PING or TRACERT to those sites, and making sure you get replies back? To use these, open the Command Prompt on your Windows 7 system (Start, type cmd and press Enter), then type PING bbc.co.uk and press Enter. You should get replies back, along with an IP address. If not, try TRACERT bbc.co.uk and press Enter. These should be the next troubleshooting methods to try

Canadian Luke
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Sounds like an MTU problem. Do you use ADSL/PPPoE? PPPoE limits your MTU to 1492 rather than the common 1500.

You may see if your router supports MSS clamping.

Ben Cook
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Yes i agreed its all about the MTU size and MSS Clamping. I was unable to open certain websites on my iPad like i do on my desktop PC, then i changed my ppoe Mtu size from 1492 to 1500, and also enabled MSS Clamping. Boommm, everything works flawlessly.

Ferio Aritonang
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