New Router - Can't Connect to One Specific Website

[mjslakeridge]

About a month ago, AT&T installed a new router/modem in my house. Chrome and Internet Explorer working fine on all computers, tablets, phones, etc.

My wife enrolls in online Continuing Professional Education (CPE) courses. After completing each 1 or 2 hour course, the provider sends her an email with a link to "Download Your CPE Certificate". In the past the link worked fine, but since getting the new router and clicking on the link, we get this pop-up:

"This site can’t be reached

The connection was reset.
Try:
Reloading the page
Checking the connection
Checking the proxy and the firewall"

We are not using a proxy server. I temporarily disabled the firewall in the router and in Windows and still can't connect. Tried pinging the web address in command prompt and got no reply (I don't remember the exact message).

Tried Chrome and IE on a Windows 7 Pro and Windows 8 Pro computer. Tried Android phone and tablet. Same error message.

Took a tablet to the public library and connected to their WIFI and got straight to the site and downloaded the CPE certificates to Google Drive.

The site in question is WWW.event.on24.com. which is a provider for many large companies that offer online training.

There are no other websites that I know of that we cannot connect to since getting the new router, just the links in the email to that site (of course the link contains a lot of information after the .com part identifying the course, date, participant info, etc. so that the correct CPE certificate is provided.

Any help would be greatly appreciated.

Edit: The message when I try to ping www.event.on24.com is "Ping request could not find host www.event.on24.com Please check the name and try again."

 

[netyoda]

Try www.eventon24.com. I removed the first period and it goes to a valid site. Not sure if its the right one though!

 

[mjslakeridge]

When I remove the first period and try to ping it, my end shows "Request timed out" 4 times. Packets sent = 4, Recieved = 0, Lost = 4.

There definitely is a period after the word event in the link provided. If I take it out I do connect to a site called eventon24.com, which presumably is the same company, but no place to retrieve CPE certificates as far as I can tell. I will have to dig around a bit.

Edit: It looks like the www.eventon24.com site is just a place where companies can advertise their webinar services, with links to companies such as GoToMeeting and Zoom.com and others. Maybe that is why the site I am trying to reach had to put the period after event.

 

[bill001g]

Try nslookup www.event.on24.com 8.8.8.8 and then do it again but leave off the 8.8.8.8

8.8.8.8 is a public google dns server. It resolves to a ip for me on google. I tend to always use 8.8.8.8 and 4.2.2.2 (level3) rather than my ISP dns.

I can not ping these either but you can open sessions on port 80 with the telnet command but not the browser. This means there is communication but the server is pretending there is not for whatever reason.

There may also be a issue with one of their servers. I see 2 ip that resolve to the same name.

 

[mjslakeridge]

Try nslookup www.event.on24.com 8.8.8.8 and then do it again but leave off the 8.8.8.8

8.8.8.8 is a public google dns server. It resolves to a ip for me on google. I tend to always use 8.8.8.8 and 4.2.2.2 (level3) rather than my ISP dns.

I can not ping these either but you can open sessions on port 80 with the telnet command but not the browser. This means there is communication but the server is pretending there is not for whatever reason.

There may also be a issue with one of their servers. I see 2 ip that resolve to the same name.

When i do the nslookup with the 8.8.8.8 it says "Google-public-dns-a.google.com can't find www.evern.on24.com: Non-existent domain"

Without the 8's the message is "dsldevice.attlocal.net can't find ..."

Could it be that AT&T gave me a new public IP address with the new router, and the company I am trying to connect with is rejecting my IP address since it is different (possibly) than when my wife first signed up for the CPE training a couple of years ago? But then why could she connect at the public library?

 

[bill001g]

Be sure you did not typo it. What you have in this post has a typo in the name.

I see
Non-authoritative answer:
Name: www.event.on24.com
Addresses: 104.239.213.7, 198.105.244.11

You may see different results because web sites do lots of tricky stuff with the DNS servers....even 8.8.8.8 is not a single server there are many hundreds in the world.

 

[mjslakeridge]

I tried it again. Same result. No Typo in my command prompt, just in me reporting the results in my post.

 

[bill001g]

That is strange you can not get a DNS resolution. The sledge hammer way to fix this is to put a entry the host file to override the DNS.

There is a file called HOSTS in
C:\Windows\System32\Drivers\etc

Then add

104.239.213.7 www.event.on24.com


You could I suppose try this IP directly in the browser rather than the name.

From my location the server appears to be functional but you may need a longer URL than just the domain to get to the right page. It pretends its down if you just put in the domain name.

DNS problems are a huge pain. Some ISP intercept dns requests even when you send them to a different DNS server. In those cases you actually use a proxy/vpn to get past the problem. There are free proxy/vpn sites that would likely get you past you issue for a while. They allow very limited traffic for free but if its a one time use thing it should work.

 

[mjslakeridge]

Bill: Thanks for your help so far. I don't want to fool around with a proxy server site. If I PM you the link they provide in the email, would you be willing to paste it into your browser to see if you can see the CPE certificate (nothing confidential). That would sort of confirm to me whether or not the site is blocking my ip address due to the new router.