ZenWiFi XT9 blocks weather.gov

[Corkie24]

Hello: long time reader, first time posting. Apologies if this is duplicative, but I have not found quite this problem solved in other threads. Long post, trying to share as much info as possible:

Short version: Asus ZenWiFi XT9 mesh system, working perfectly except that it blocks access to the National Weather Service website https://www.weather.gov

Details: I finally replaced our Asus RT-AC68U which I created from a T-Mobile TM-AC1900. After much research, settled on an Asus ZenWiFi XT9 mesh system, which I installed two weeks ago. I’m delighted with the Wi-Fi speed and the ability to get that speed throughout the house, which previously was not possible. Only one problem: when I try to reach the National Weather Service website https://www.weather.gov , access is blocked.

When I try to access using Firefox web browser running on a Windows 10 computer, I get the following message:

Access Denied

You don't have permission to access "http://www.weather.gov/" on this server.

Reference #18.2dda0760.1734534178.120347a0

https://errors.edgesuite.net/18.2dda0760.1734534178.120347a0



When I try to access using Microsoft Edge on that same Windows 10 computer, I get a similar but slightly different message:

Access Denied

You don't have permission to access "http://www.weather.gov/" on this server.

Reference #18.84fe3d17.1734536267.b66ed2cb

An error has occurred

Note that on both browsers, even though I am typing in the https:// address, the error message specifies the http:// address.

I get the access denied message despite trying on multiple devices (more info below). The ISP is AT&T, and the ISP gateway device is an AT&T Arris Wi-Fi modem. When I connect directly to the AT&T Arris device, both by the Arris wi-fi and by connecting to an ethernet port on the Arris device, I am able to access https://www.weather.gov (will abbreviate this as “weather.gov”) without a problem. This suggests that the problem definitely lies with the Asus router, not with the ISP.

Here’s what I have checked, and tried:

• When I installed the router, I allowed it to update the firmware. The router currently is running Asus firmware version 3.0.0.4.388_24684. As of 18 December 2024, the Asus website shows this as the most recent firmware version (dated 2024/11/05).
• I can’t connect to weather.gov through the Asus router, neither by wi-fi nor by plugging into one of the ethernet ports on the Asus router.
• I shut off and rebooted the Asus router, including both the box attached to the ISP gateway and the remote unit. After rebooting, still unable to connect to weather.gov through the Asus router.
• Thinking this might be a double NAT problem, I put the AT&T Arris IP gateway into IP Passthrough mode, which is AT&T’s version of bridge mode (details at https://www.att.com/support/smallbusiness/article/smb-internet/KM1188700 ). Still unable to access weather.gov through the Asus router.
• I turned off IP Passthrough, thereby also re-enabling the firewall in the AT&T Arris device, and then turned off the firewall in the Asus ZenWifi XT9. Still unable to access weather.gov through the Asus router.
• I don’t think it’s a DNS cache issue. This problem has persisted across multiple days (with PCs that are shut down at the end of the day) and across multiple devices that access the Asus wifi router, including three different Windows computers, a Mac OS MacBook, and two different Android phones that reboot every night. Just for the sake of completeness, I flushed the DNS cache on a Windows desktop. Still unable to access weather.gov through the Asus router.
• I've looked at the Asus router’s firewall URL filter to make sure that weather.gov isn't blacklisted. It is not; in fact, there are no websites currently blacklisted or whitelisted. I tried whitelisting weather.gov, and that didn't fix the problem, either.
• The Asus router’s firewall keyword filter is disabled.
• The Asus router’s network services filter is disabled.
• I have the TrendMicro AiProtection enabled. As an experiment, with the Asus firewall enabled, I turned “Enabled AiProtection” to the “OFF” setting. Still unable to access weather.gov through the Asus router.

I tried calling Asus’ tech support. The first response from the technician I spoke with was “Oh, your access is being denied because this is a government website.” That was obviously nonsense. When I pushed back, she was unable to offer any other suggestions. She said she would elevate the issue and I would hear back from someone in two days. That was a week ago, and I’ve heard nothing further. I think I’m on my own with this.

Given that this is a problem with one specific website, and that I’m otherwise able to access every website I’ve tried, and connect to the servers of our various email providers, I’m convinced this is most likely a problem with a firmware setting. I would welcome any suggestions. Thanks!

 

[OzarkEdge]

If you think it's the router, I would reset its firmware, configure minimally from scratch, and try again with nothing else in play except your admin PC and WAN. Should just work like any website.

OE

 

[Corkie24]

I appreciate the response. Just to be clear, for this Asus, does "reset its firmware" mean this:?
"Administration" tab>"Restore/Save/Upload" menu>"Factory default" - click on "restore" button

Thanks,
C

 

[bennor]

@Corkie24, didn't see it mentioned in your initial post but what are you using for DNS servers, both on the WAN page and on the LAN DHCP Server page? Try selecting a different DNS server(s) if you haven't done so already.
Are you using Pi-Hole or AdBlockHome or similar DNS filtering/sink hole programs?
What specific Arris device do you have? Is the Arris connected to to another AT&T device within your location (like ONT)?
Do you have DSL, cable or fiber for broadband?