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Only one computer on network cannot access some sites. How to fix it?


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10 replies to this topic

#1 derekwildstar

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Posted 28 March 2017 - 09:15 PM

Hello everybody! 
 
On my first post I'm bringing to all you a very VERY strange problem! Lets go!
 
Some days ago I was trying to access the site "www.frigelar.com.br", but I figured out that the site was inacessible, but I noted that I CAN access this site, using my cellphone AND my laptop. All the three devices are on the same network, only my Desktop PC cannot acces the mentioned site.
 
I've tried everything that I know about this kind of problem, but of course my Windows knowledge is very limited, and so, I'm here. I found that this probem is occurryng with another site (www.consul.com.br). I really need to try to solve this problem. I do not want to format or hard reset my Windows before that some specialists try to fix this weird problem.
 
That's the question: What I need to do?


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#2 FreeBooter

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Posted 29 March 2017 - 03:14 AM

The firewall and antivirus program could be blocking the website.

Change DNS servers to google public DNS servers and see issue resolves.


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#3 derekwildstar

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Posted 29 March 2017 - 08:32 AM

The firewall and antivirus program could be blocking the website.

Change DNS servers to google public DNS servers and see issue resolves.

 
Hello FreeBooter!
 
1. The Firewall is off, this is not the problem
 
2. The antivirus program is off, this is not the problem
 
3. The DNS is unique for all devices on the network, configured at router and other devices (connected at the same network) can access the site without problem, except this Desktop PC. The DNS configured is already the google dns (8.8.8.8 and 8.8.4.4). I tried another free DNS and the result was the same: no access to www.frigelar.com.br
 
Mod edit :-  Reference to deleted irrelevant post removed.

Edited by Chris Cosgrove, 29 March 2017 - 04:52 PM.


#4 Kilroy

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Posted 29 March 2017 - 11:13 AM

Do you have any other security programs running?

 

Can you go to other sites?

 

Can you ping the site from that machine?

 

Can you ping the site from another machine?  If so, can you go to the site on the problem machine using the IP address?



#5 derekwildstar

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Posted 29 March 2017 - 01:02 PM

Do you have any other security programs running?

 

Can you go to other sites?

 

Can you ping the site from that machine?

 

Can you ping the site from another machine?  If so, can you go to the site on the problem machine using the IP address?

 

Hello Kilroy, the answers follows respectively

 

1. Definitively not :/. No firewal or antivirus
 
2. Yes! Others sites work perfectly on this desktop PC. This problem is affecting only some sites, and I said "some sites", because I guess there are another ones, but, to focus on the problem, actually, only www.frigelar.com.br and www.consul.com.br are inacessible
 
3. Not! I also cannot ping these sites from the problematic machine. The result is always timeout. Even the tracert command fails after some steps, not reaching the destination host
 
4. Yes! As I mentioned before, this problem do not affect another machines on the same network. The site is accessible, the ping and the tracert commands are executed successfuly. On another machines/devices the site can be accessed by host nane or IP address. This is not a DNS problem, unfortunatelly.
 
Talking about DNS, only for your information, on executing ping or tracert command the host name (frigelar.com.br) is being correctly translated to its IP, so, again, this is not a DNS problem :(


#6 Kilroy

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Posted 29 March 2017 - 03:51 PM

That's why I wanted you to ping it from another machine to get the IP address, then you could try to go to the IP address on the problem machine.  If you could, then DNS would be the problem.

 

.com.br is a Brazilian site, so I'm pretty much out of ideas on why.  Normally you're looking at DNS or security software.

 

How about VPN software?



#7 derekwildstar

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Posted 29 March 2017 - 04:04 PM

That's why I wanted you to ping it from another machine to get the IP address, then you could try to go to the IP address on the problem machine.  If you could, then DNS would be the problem.

 

.com.br is a Brazilian site, so I'm pretty much out of ideas on why.  Normally you're looking at DNS or security software.

 

How about VPN software?

 

Hello Kilroy,

 

I will do this test and I'll reply with the results soon, thanks!

 

Yes! This is a brazilian site. I'm brazilian, but let me say you something more about this problem. Last year this problem has occured with my own site (zettaomnis.net.br), but it was intermitent, i.e., was more difficult to solve, because sometimes the site was accessible but another times not. This year I found that these two sites (frigelar.com.br and consul.com.br) with the very same problem, but, this time, they are always inacessible. This turns the tests more easy, I guess.
 
One other thing about my own site is that it is hosted by Go Daddy, on North America, so I guess (again) that the problema is no related with the place nor the domain. After I do your suggested test you will see that the problem is not the DNS ;)
 
VPN Software? Proxy? No, I do not use this type of sofware or configuration. My Internet is a simple ADSL 2+


#8 FreeBooter

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Posted 29 March 2017 - 04:12 PM

Maybe we should reset TCP/IP protocol if you want to use the batch script attached to this post.

 

 

Attached File  ResetNetworkCompenents.zip   44.81KB   5 downloads


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#9 derekwildstar

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Posted 29 March 2017 - 04:23 PM

Maybe we should reset TCP/IP protocol if you want to use the batch script attached to this post.

 

 

attachicon.gifResetNetworkCompenents.zip

 

Hi FreeBooter,

 

I will do this and I'll reply with the results soon, thanks!

 

I'll do this and later I 



#10 derekwildstar

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Posted 30 March 2017 - 12:32 PM

Hello guys!

 

I finally solved my problem. It was not the way I wanted it, but the result was achieved. I'll explain how I solved it.

 

First I must confess that I was not totally accurate in my words. I was fooled by logic! I learned that when it comes to networks, logic is something that needs to be left out. I swore that only my machine was not able to access the sites because my Android phone could do it without problems, but yesterday I tested other PCs on the network and found that in fact no Windows PC could access the sites. Two PCs with Windows 10 and two PCs with Windows 7 and none of them could access the sites, but my Android phone could always. I thought then that the problem was related to Windows in general, but how did all my PCs have the same problem? And more, how different versions of Windows had the same problem? I thought about a virus and that's when I did another test. I shared my 4G network of the cell phone with my notebook, making it use the mobile network and ... THE SITES OPENED! That is, I concluded that the problem was not in Windows, but in the relationship between Windows and my network. I thought it might be a problem with my ISP, but what kind of limitation affects only one operating system?

 

That's when I had a different idea: I decided to connect my PC directly to my ADSL modem and ... THE SITES OPENED! I finally managed to isolate the cause of the problem: my router! After that I began to check what kinds of settings potentially affect my network in this peculiar way. I was not successful ... DD-WRT is very complex and may have more settings than the ones it was displaying. I then decided to return his settings to the "factory" state, and finally, after reconfiguring it as before, everything is working as it should.

 

In short, I could not identify the exact cause of the problem, but I was able to solve it using brute force. Thankfully I did not have to format my machine or resets Windows because it would not work and I would be much more frustrated. The tip is:

 

Whenever dealing with connectivity problems, value logic less, because there are things that have no apparent explanation but can happen. We need a little bit faith in dealing with network problems ;)

 

Thanks to all who helped!



#11 FreeBooter

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Posted 30 March 2017 - 02:48 PM

We are glad to hear you have resolve the connection issue and thank you for letting us know how you have solve the connection issue!

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