Win7 x64 can't connect to certain websites

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tigercorp

668 posts

Ultimate Geek

#75850 24-Jan-2011 17:40

So, I'm visiting our Sydney office and have run across a weird problem.

On 3 different Win7 x64 clients none of them can connect to (or ping) certain websites, such as qantas.com.au. The name will resolve ok.
However, on the same network, any 32 bit machine (XP or Win7) can connect and ping successfully.

Now if I set my proxy server to an open proxy such as 203.176.105.33 then it works fine.

ISP is iiNet.

Does anyone have any troubleshooting ideas?

richms

28189 posts

Uber Geek

Trusted

Lifetime subscriber

#430660 24-Jan-2011 17:52

Try turning off all the ipv6 crap that is on by default in 7. I had issues with it not working properly with it on when using a friends network, was fine on mine all along tho. Something to do with the DNS in the router.

Richard rich.ms

raytaylor

4014 posts

Uber Geek

Trusted

#430677 24-Jan-2011 18:50

+1
Was gonna suggest turn off ipv6 too.

Ray Taylor

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tigercorp

668 posts

Ultimate Geek

#435630 5-Feb-2011 12:23

Update...

We had tried turning off IPv6 with no joy. Then for a week or so things miraculously just started working and then just stopped again.
This made me think it was something hardware related on the ISP/web side so I finally tried lowering the MTU on the workstatations, which worked.

Seems strange as the 32bit machines all had the same Windows default MTU size of 1500, as did the 64bit machines??

Oh well, it worked, just thought I'd share that...