Early december I lost access to several sites for no apparent reason, this happened at the same time on my desktop pc and my laptop. It's still no better and Orange have been useless! Iwent to McDonalds today just to update defender and get my hotmails!
Anyway after finding this site I have changed the MTU on my Belkin G+ Wireless router to 1492 (the max it will allow). Hey presto some of the sites have reaplied. Sadly not all!
I am running vista so tried the above to view the laptops MTU and see they are 1500.As this is higher (just) than my router I figure it may be the cause of he problem.
I tried to then recet but got "the requested operation requires elevation". Short of sitting on the roof I could do with some more help.
About 4 weeks ago both my desktop and laptop started with this issue. Rang the now infamous Orange tech support who knew less about PCs than I and I'm no expert - simply an internet surfer. After many phone calls the detail of which I wont bore you with I returned back to work after the Xmas break yesterday, did a bit of googling, found this website and threads, went home and lo and behold a bit of pinging and MTU changes later on my wireless router and Vista settings (as noted elsewhere) everything works once more! Many thanks to all and this site is now logged as one of my favourites!
Cheers to the real technical support guys & girls here.
Found out that if your Vista has multiple users you need not only to be an administrator but you need to right click the command prompt and run as administrator.
Exactly as post above. Orange physically don't seem to bad but the technical help is absolutely shocking and charges 50p/min for the privilege.
I now have fully restored internet due entirely to this and similar forums.
Ta
If you have Vista and can't access certain sites etc. you need to change your MTU setting. DrTCP does not work in Vista so you have to change the MTU from command prompt with administrator privileges.
Command prompt can be found under Start>Accessories>Command Prompt
(right-click on the command prompt and select 'run as administator')
now you need to view your MTU settings type and the name of your interfaces to do this type:
netsh interface ipv4 show subinterfaces
Once you have seen the interface and MTU setting you wish to change type the following:
netsh interface ipv4 set subinterface "name of interface" mtu=NEW MTU NUMBER store=persistent
For example to set the MTU to 1430 for my interface called Local Area Network I would type:
netsh interface ipv4 set subinterface "Local Area Network" mtu=1430 store=persistent
Once this is done, restart your laptop, connect to your wireless and hey presto. Done.
Ryder
UPDATE: Corrected my spelling mistake for 'persistent' in the commands above.
If you are using your wireless connection, replace ''local area network'' with ''wireless network connection''
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