Why can I not access certain web sites?

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I am having the SAME problem.. I cannot get to websites such as CNN, and Google. This is drving me crazy, I have tried every recommendation that I have run across.. PLEASE, can someone give some ideas?

i have the same problem, although its more extensive. i can't access any internet sites from my username, yet the 3 other accounts on my pc all have no problem browsing the web. i can use msn messenger and my ftp program, but just no internet! i'm stumped on what to do!

i have recently formated my computer and installed norton internet security 2006.
i have a website of my own http://www.tm4ever.net.
but since i formated the computer i cannot go into the site and also it is the only website i cannot go into, i try to deable norton but still couldnt get into the site.
why is that.
please help me.
\ray

I can't access google.com anymore or sites that use google like gmail! I don't know what the heck the problem is... I know google is not down, but I still get a 404 error. I can't access these sites on my computer or my dads and we are both running seperate ips and seperate programs.

i can't access many of the sites like yahoo, orkut, hotmail.. i don't know whats wrong.. everytime i try to open them ,it says "this page cannot be displayed".. please give me some solution..

It's not often that i post comments - in fact i never do, but on this occasion i think that a few words of appeciation to Ronnie is the least i can do. I've been experiencing the same problem as most here and it's been driving me mad. I have a PC running Win2K connected to a dsl modem. I have a laptop with XP that is networked to the PC for net access. The other day i changed isp's and for some reason the laptop stopped accessing certain sites. I did all the usual checks, virus scans, adware scans, lowered security and firwall settings and checked all the network settings. Nothing worked. That's when i turned to the web and found this site. I got the laptop and followed Ronnie's instructions to set the MRU(very quick and very simple). I rebooted the laptop and like magic - all the sites were accessable again! Anyone who has this problem should try this solution first.
Thanks again Ronnie - you're a star!
M

Are you all using AOL by any chance?

I can't access google.com anymore or sites that use google like gmail! I don't know what the heck the problem is... I know google is not down. I can't access these sites on my computer.

I have the same problem where I cannot access one particular website while at work. I can access it at home. Here is everything I looked into:

1. MTU thing: http://www.annoyances.org/exec/show/article04-107
and found that I could go to cmd and ping -f -l 1454 XXX.XXX.XXX.XXX without a loss. I entered MTU DWORD's in all for keys but still couldn't access site. The next day I couldn't ping -f -l 1454 XXX.XXX.XXX.XXX anymore. I tried pinging MTU of 1250 and it returned without losses but the DWORD fix didn't work this time either. I later found out that the router's MTU setting was disabled (I'm not sure what this means).

2. Opened HOSTS file: C:\WINDOWS\system32\drivers\etc\hosts in notepad and didn't find any exceptions.

3. Ran spyware (Adaware, Spybot, etc.) and found nothing. Nothing in HijackThis log. Up to date Nortons 2006. Tried to access site in Safe Mode with Networking and it didn't work.

4. Made all internet settings default. Windows Firewall disabled. I usually us Firefox (Version 1.5.0.2) but can't access site in Firefox or IE. Tried checking and unchecking TLS, SSL. All forms of router security is disabled (LinkSYS BEFSX41 Firmware Version: 1.50.18).

5. Ran Winsock XP Fix: http://www.snapfiles.com/get/winsockxpfix.html

6. Ran this batch file I made after remembering this fixed the same problem I had about a year ago. Made a txt with the following info and renamed with .bat extension:

regsvr32 softpub.dll
regsvr32 wintrust.dll
regsvr32 initpki.dll
regsvr32 dssenh.dll
regsvr32 rsaenh.dll
regsvr32 gpkcsp.dll
regsvr32 sccbase.dll
regsvr32 slbcsp.dll
regsvr32 cryptdlg.dll

7. Ran SFC by going to cmd and typing sfc /scannow
[See Microsoft Knowledge Base: 310747 Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe)].

8. Deleted all temporary info (Cache, temp internet files, cookies, etc).

9. Went to cmd and ran ipconfig /release

10. Went to cmd and ran netsh int ip reset c:\resetlog.txt and all it said in the txt was . (http://support.microsoft.com/kb/299357/#top)

11. Went to cmd and ran ipconfig /flushdns

None of the computers on the network can go to this site. It seems to point to either the router or isp. I cannot find anything out of the ordinary on the routher. We have cable internet with static ip's.

What clued me into this problem was that one of the computers at work was not able to search travelocity.com for a plane ticket which she has done in the past. This problem was discovered on 04/26/06. However, the computer that I use at work could access travelocity.com and search for plane tickets. I went through the standard checks mentioned before with the computer that couldn't get on travelocity.com as well. Seeing that this is at work, creating new user profiles and migrating old ones over and running system restore are my ABSOLUTE last options.

Our ISP came and changed the modem out about a month ago. I'm not sure if that could have anything to do with it or not. I have tried resetting the modem.

All office computers use Windows XP Professional SP2 with automatic update.

All is right with the world. Turns out it was the ISP that was all screwed up. They finally fixed the problem.

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