I have a problem: Some sites are not accessible

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I have a problem: Some sites are not accessible

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
I have a problem: Some sites are not accessible
I have a problem: Some sites are not accessible
2017-07-20 17:27:54
Model :

Hardware Version :

Firmware Version :

ISP :

Model :


Hardware Version : Not Clear


Firmware Version :


ISP :


Hi All,


I am using WiFi router with following info.
Model No. TL-WR841N / TL-WR841ND.
Firmware Version:
3.16.9 Build 150310 Rel.54318n
Hardware Version:
WR841N v9 00000000


I am connecting my Ubuntu laptop 14.04 LTS over WiFi, I am facing one strange problem, some of the sites are not opening.
For example : https://www.codecademy.com
I am getting following error on chrome:


No data received
ERR_EMPTY_RESPONSE


And following error on firefox:


Secure Connection Failed


The connection to the server was reset while the page was loading.


The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.


I am some experiencing package drop also when I am ping google.co.in




I tried following things :
1. reset router to default config // No use
2. Update firmware // no use
3. Change DNS to 8.8.8.8 and 8.8.4.4 // no use
4. Change DNS provide by ISP // no use




Somebody can help me?!
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Re:I have a problem: Some sites are not accessible
2017-07-20 19:00:21
to locate the problem, if your connect that Ubuntu laptop directly to the modem bypass the router, can you open that website?
if you can not, which means that this is isp or modem issue.
if you can, then it is a router issue.
try to manually put 8.8.8.8 for the dns server and lower the mtu to 1480.
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