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Desdinova
Premium
join:2003-01-26
Gaithersburg, MD

Unable To Load Some Websites

Within the past month I've been having trouble loading certain websites on one of the computers on my network (the sites load fine on any other computer plugged into the hub). It doesn't matter if I try Firefox, Chrome or IE. If, however, I'm running my VPN connection on this computer, the sites will load without issue.

So SOMETHING is preventing these sites from loading under "normal" circumstances and I really have no idea what I should check. If anyone has any ideas, I'd appreciate it. Thanks!



tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
kudos:9
Reviews:
·G4 Communications
·Fairpoint Commun..
·Hollis Hosting

Check to see if perhaps the misbehaving site are in hosts file.

Are you using the same DNS server on the problem PC as the OK ones?

Try doing a traceroute (tracert in windows) to the sites on the problem and good PC. Does the name resolve to the correct IP address? Not all sites respond to Ping but if they do should be able to run traceroute from both PCs. Keep in mind routing can change moment by moment but should give you some ideal of what is going on.

/tom


Desdinova
Premium
join:2003-01-26
Gaithersburg, MD

Thanks for jumping in to help. I'm pretty good with some areas of Windows and stone cold ignorant in others...: I checked the hosts file and it's clean but I'm not sure how to check the DNS server. I ran ipconfig and on the quirky PC I get 192.168.0.1 but on one of the computers that's working, ipconfig shows 75.75.75.75. I tried setting the quirky PC to those numbers but it didn't make any difference.

The quirky PC doesn't appear to be pingable and the steps I've tried (so far) using the tips here on DSL Reports hasn't made any difference. I don't even know how to run traceroute.



tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
kudos:9
Reviews:
·G4 Communications
·Fairpoint Commun..
·Hollis Hosting

Sorry if I was not clear. I just wanted you to try to determine if the PCs were resolving to the same IP address.

To do a tracecert use the command line and type:
"tracert URL." Here is the traceroute to this site. The first line is the result of the DNS lookup.

C:\Documents and Settings\Tschmidt>tracert DSLreports.com
 
Tracing route to DSLreports.com [209.123.109.175] over a maximum of 30 hops:
 
  1    <1 ms    <1 ms    <1 ms  192.168.2.1
  2    22 ms    23 ms    22 ms  10.20.6.1
  3    22 ms    22 ms    22 ms  64.222.166.165
  4    31 ms    27 ms    27 ms  pool-64-222-213-132.port.east.myfairpoint.net [6
4.222.213.132]
  5    35 ms    30 ms    30 ms  xe-1-2-0.mpr4.bos2.us.above.net [64.125.71.169]
  6    41 ms    42 ms    42 ms  xe-5-2-0.cr2.dca2.us.above.net [64.125.24.114]
  7    56 ms    44 ms    43 ms  xe-7-2-0.cr1.dca2.us.above.net [64.125.26.41]
  8    42 ms    42 ms    41 ms  xe-1-0-1.er1.iad10.us.above.net [64.125.26.238]
  9     *        *        *     Request timed out.
 10    46 ms    43 ms    44 ms  0.lag2.tbr2.tl9.nac.net [209.123.11.121]
 11    49 ms    49 ms    50 ms  0.e1-1.tbr2.ewr.nac.net [209.123.10.133]
 12    45 ms    45 ms    45 ms  0.e1-4.tbr2.oct.nac.net [209.123.10.126]
 13    45 ms    45 ms    44 ms  vlan808.esd1.oct.nac.net [209.123.10.42]
 14    46 ms    45 ms    45 ms  www.dslreports.com [209.123.109.175]
 
Trace complete.
 

I'm assuming the 192.168.0.1 and 75.75.75.75 are the DNS addresses you discovered. It is unusual to have dynamically configured PCs with different settings. Assuming you are running a LAN with private IP addresses 192.168.0.1 is the address of your router. It relays DNS requests from the computer out to your ISP's DNS resolver. 75.75.75.75 IP is assigned to Comcast. I assume Comcast is your ISP.

You can specify a static DNS entry even though you are using DHCP for address assignment.

From the command line do "ipconfig /flushdns"
That will clear the DNS cache.

Then go to Network Connection page. You can type ncpa.cpl from the command line or use the GUI. Select properties of the interface you are using and highlight the Internet Protocol TCP/IP or TCP/IPv4 in later version of windows. In the General Tab you should see the option to set IP address manually or statically and below it options for DNS.

Try using the Google public DNS 8.8.8.8 and see what happens.

Below is an example of ipconfig /all report. It shows the IP address of the computer as well as the DNS server or servers being used.

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
 
C:\Documents and Settings\Tschmidt>ipconfig /all
 
Windows IP Configuration
 
        Host Name . . . . . . . . . . . . : Tom-Desktop
        Primary Dns Suffix  . . . . . . . :
        Node Type . . . . . . . . . . . . : Unknown
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
 
Ethernet adapter Local Area Connection:
 
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
        Physical Address. . . . . . . . . : 00-15-60-4E-D9-6F
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.2.18
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.2.1
        DHCP Server . . . . . . . . . . . : 192.168.2.1
        DNS Servers . . . . . . . . . . . : 192.168.2.1
        Lease Obtained. . . . . . . . . . : Friday, November 30, 2012 :21:28 AM
        Lease Expires . . . . . . . . . . : Sunday, December 02, 2012 9:21:28 AM
 
C:\Documents and Settings\Tschmidt>
 

Good Luck

/tom

Desdinova
Premium
join:2003-01-26
Gaithersburg, MD

Thanks again. I'm still having some issues but I'm definitely better informed on how to proceed. That alone is greatly appreciated and helpful!


GroovyPhoenx

join:2006-05-22
Gloucester, ON

Spyware checked? Malware byes run? Could certainly be malware installed on that PC that is causing the issue, redirecting websites?

Other then that, right off the top of my head with no other information it's hard to guess...

Expand your moderator at work

Desdinova
Premium
join:2003-01-26
Gaithersburg, MD
reply to GroovyPhoenx

Re: Unable To Load Some Websites

Yeah, it's a bit weird. I ran scans with Malwarebytes and nothing came up.