Forum Discussion

Star

Apr 05, 2020

Solved

Suddenly cannot access one website, but an older router has no problem

This is a very strange problem. Let me explain: I've been using the RBR50 and RBS50 (satellite) for over a year without any problem. I've been accessing many different websites, including one i...

Casey_SJ
Apr 05, 2020
UPDATE #2:

I removed the Securifi Almond+.
Configured the RBR50 back to Router Mode.
Changed the MAC address of RBR50 to that of en0 from a computer I own.
Rebooted the RBR50.
Rebooted the Cable Modem (this is necessary).
Result:

Problem Solved.
So it seems the previous MAC address has been blacklisted somewhere along the route.
Will contact the site administrator to see if there's anything they can do.

Thank you very much to everyone for your wonderful support. It's sincerely appreciated! :)

Casey_SJ

Star

Apr 05, 2020

Certainly... This screenshot shows the changes:

Modified DNS

The new traceroute is as follows (interrupted after 29 hops):

 1  192.168.1.1 (192.168.1.1)  4.321 ms  2.029 ms  2.173 ms
 2  96.120.88.81 (96.120.88.81)  13.874 ms  10.274 ms  11.712 ms
 3  be-20009-rur02.sanjose.ca.sfba.comcast.net (162.151.30.233)  13.789 ms  12.561 ms  11.080 ms
 4  162.151.78.85 (162.151.78.85)  13.833 ms  14.953 ms  10.812 ms
 5  be-231-rar01.santaclara.ca.sfba.comcast.net (162.151.78.249)  15.763 ms  14.897 ms  12.931 ms
 6  be-3651-cr02.sunnyvale.ca.ibone.comcast.net (68.86.91.73)  14.787 ms  18.954 ms  16.855 ms
 7  be-11025-cr01.9greatoaks.ca.ibone.comcast.net (68.86.87.158)  22.458 ms  14.405 ms  18.239 ms
 8  be-11525-cr02.losangeles.ca.ibone.comcast.net (68.86.84.149)  24.019 ms  22.085 ms  21.126 ms
 9  be-11523-cr01.houston.tx.ibone.comcast.net (68.86.87.174)  52.305 ms  50.698 ms  54.259 ms
10  be-11423-cr02.56marietta.ga.ibone.comcast.net (68.86.85.21)  60.982 ms  72.351 ms  64.092 ms
11  be-1302-cs03.56marietta.ga.ibone.comcast.net (96.110.32.77)  64.393 ms  66.857 ms  62.374 ms
12  be-2301-pe01.56marietta.ga.ibone.comcast.net (96.110.32.94)  61.305 ms  64.259 ms  62.977 ms
13  75.149.230.90 (75.149.230.90)  62.451 ms  64.381 ms  67.863 ms
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *

I should add that the site is also inaccessible with this change... Really puzzling stuff... Maybe I should reconnect the Securifi Almond+ temporarily and run "traceroute" to compare. I retired the Almond+ because it lacks Mesh WiFi, which I need for my 2-story home.

ekhalil

Master

Apr 05, 2020

Did Orbi reboot after making the DNS change?

Is the problimatic site an https site? Do other https sites work well? Please try the solution here for a test: https://community.netgear.com/t5/Orbi/Orbi-Blocking-Websites-Solved/m-p/1677125/highlight/true#M74168

Looks to me that there is some conflict between Orbi and the cable modem.

Casey_SJ
Star
Apr 05, 2020
Couple of quick answers before I try the solution in the link:

Orbi rebooted after changing DNS.
The website in question is an "https" site.
Most websites today have shifted to "https" and all of them are fully accessible. (Well, all the ones that I visit are fully accessible.)
Casey_SJ
Star
Apr 05, 2020
Just went through the linked thread. Changes made as follows:

Orbi did not reboot after clicking "APPLY". But the website in question remains inaccessible. All other "https" sites are still okay (which includes this one -- community.netgear.com).

You may be right about a possible conflict between the Orbi router and cable modem. The new modem (Arris SB8200 DOCSIS 3.1) should be delivered on Wed or Thurs of the coming week. I'll certainly update this thread if the problem disappears after switching to the new cable modem.
ekhalil
Master
Apr 05, 2020
I can't see the screenshots that you post until an administrator approves them. Please use attached files instead.
One more thing to try, to make sure that the new DNS change took place. Please go to >> ADVANCED >> Setup >> Internet Setup >> and click on "Test". This will make sure that the new DNS settings will take place. Please test after that.
Please try different DNS servers like 1.1.1.1, 8.8.4.4, .....
Casey_SJ
Star
Apr 05, 2020
After changing Primary DNS to 1.1.1.1 and secondary DNS to 8.8.4.4, I captured a screenshot and attached it here. Clicked APPLY, then clicked TEST. The router rebooted.

But alas the website remains inaccessible...
ekhalil
Master
Apr 05, 2020
I think we'll need to wait to see if the new cable modem will make things better. The traceroute shows issues only after going out of the comcast network.
One question though, do you have the same problem from devices connected to the Router and devices connected to the Satellite?
Casey_SJ
Star
Apr 05, 2020
Yes unfortunately it's affecting devices connected to both the router and the satellite. From the Advanced --> Administration --> Attached Devices page I identified a device connected to router and one connected to satellite. Both respond the same way -- specifically, both devices are unable to access that site, but can access all other http and https sites.

I just connected this iMac to my iPhone via Personal Hotspot, and of course the problematic site works with no problem. The iPhone operates through Verizon and "traceroute" completes in 17 hops. Because I am limited to 1GB per month of cellular data, I've avoided using the Personal Hotspot.

Next steps:

Wait for new Arris SB8200 to arrive.
Temporarily reconnect Securifi Almond+ and check traceroute.
Thank you for your (ongoing) help...

By the way, that problematic website is important to me because I have responsibilites there as a moderator.