[kpremote]

Apologize if this is not the right place to ask for help.

Two days ago when I began to develop a web site backend, a strange thing happened. Visiting "mydomainname.com" in Firefox v66 gave me back error message saying site not found, but visiting "mydomainname.com/index.html" (or index.php) would be fine, the content of that page was returned.

After one hour struggle, I used another browser (and my phone) to open "mydomainname.com", and it worked fine! It returned the index.html page. So it's not the issue of the default file setup.

Did I miss something obvious? I felt stupid. I am now using Chrome but I would like to come back to Firefox. Thanks for any help.

[cpeterso]

Does the error happen in a Private Browsing window? Maybe Firefox cached some "site not found" result it shouldn't have? This sounds more like a server configuration issue than a Firefox bug.

[kpremote]

__Edit: I installed the lastest Firefox v67, the problem is gone. It works great.__

Thanks. no it's not in a private browsing window.

I also asked other people to visit the site(mydomainname.com) from their computers and phones, all worked fine.

The hour long struggle left me with painful memories. :) I never had issue like this previously in Firefox or other browsers. On that day, Chrome and IE worked without problem on my computer (Win 7 32bit), so the computer should not be the culprit.

That leaves Firefox v66 standing. I don't know why.