Comments on: Why does my web site show up for everyone but me?

Question: Why does my web site show up for everyone but me?

bflora — Sat, 19 Jul 2008 10:56:28 -0800

I've got a web site that shows up just fine for everyone except me. I get a big fat "page not found" when I navigate to it even though it works fine in proxy browsers, I've used ipconfig/flushdns and cleared my browser cache. I'm sure it's a DNS issue of some sort, but have no idea what else to do. Help?

By: jon4009

jon4009 — Sat, 19 Jul 2008 11:01:34 -0800

How long has the site been up? Has it moved recently? Often the DNS entry will be cached somewhere along the line to you, usually at your ISP, and there's nothing you can do about it until their cache expires.

Perhaps compare what the NSLOOKUP <domain> command returns for you versus others who can see it correctly, to confirm this is the case.

By: bflora

bflora — Sat, 19 Jul 2008 11:07:37 -0800

I recently decided to upgrade to a VPS...I set up my new nameservers and aimed my domain at them. Then I learned it could take up to a week for the new nameserver setup to propigate fully, so I redirected the site to its original nameserver for the next few days until things slow down. Since doing that, its working for everyone but me.

By: jon4009

jon4009 — Sat, 19 Jul 2008 11:30:41 -0800

Right... so sounds like you've picked up the "new" settings, which you since reverted, which are now cached until whatever the expiry is (usually a day or two).

Everyone else is still on the old, working settings, and they never saw the temporarily broken ones.

So.. just sit it out and eventually your new settings will expire and you'll get the current, older version that works for everyone else :) Something you might want to do is reduce the TTL settings on your domains (if you can) to maybe 5 minutes, that way when you try to move it again the cache won't stick for so long and you'll avoid this problem.

By: bflora

bflora — Sat, 19 Jul 2008 12:17:48 -0800

Ick. I think it's comcast. Why on earth would they help me with this somewhat technical problem?

This does sound like exactly what's happening though.

By: Mwongozi

Mwongozi — Sat, 19 Jul 2008 13:36:51 -0800

Are you hosting it from behind NAT?

By: twine42

twine42 — Sat, 19 Jul 2008 13:41:26 -0800

Adding the IP and hostname to your host file will tell you if you can see it at all or if it's a block somewhere upstream of you...

By: bflora

bflora — Sat, 19 Jul 2008 15:15:12 -0800

I don't know what NAT is. Sorry. And I don't know what my host file is either....I'm on shared hosting so I don't think I've got access to it if there is one.

By: bflora

bflora — Sat, 19 Jul 2008 15:15:35 -0800

I think I'm just stuck waiting for who know how long until Comcast purges ther DNS or something. ugh.

By: jon4009

jon4009 — Sat, 19 Jul 2008 16:13:02 -0800

I doubt your ISP would help you. In fact if you were to phone up any large ISP and ask then to flush their DNS cache they would probably either greet you with a dumb silence or just ask you to reboot your PC ;)

Anyway as twine42 says, you can add an entry to your hosts file that will short-circuit the process and allow you to specify hard-coded IP addresses for specific hosts. This allows you to bypass the DNS system, and takes precedence over it, so be sure to remove it later.

To do this on Windows, open up the file C:\Windows\System32\Drivers\Etc\Hosts with Notepad, and add a line at the bottom in the format:

<ipaddress><tab><hostname>

For example:

www.metafilter.com 74.53.68.130

By: jon4009

jon4009 — Sat, 19 Jul 2008 16:14:19 -0800

Oh and yeah sorry, this only affects your local PC... it's just sorta saying "Ignore whatever DNS tells you, I know better".

By: jenkinsEar

jenkinsEar — Sat, 19 Jul 2008 18:31:21 -0800

you can use opendns.com for DNS services instead of comcast. It's free, although ad supported (they show a search page with ads if you fat finger a domain name), and they will be able to track the sites you visit- (comcast can do this too if they want to), so be aware that there are some privacy implications if you choose to use them.

By: Haydn

Haydn — Sun, 20 Jul 2008 21:01:01 -0800

Are you working in an internal LDAP domain with the same domain name as your website? If so, you will need to create DNS entries on your internal DNS server for the website.