Comments on: DNS Hell

Question: DNS Hell

scarabic — Wed, 26 May 2004 11:11:52 -0800

DNS hell! My Windows 2000 box seems to have some kind of DNS problem. Certain sites just 404 or time out. I know it's not my net connection, because other computers on my network can get to these sites. I've already renamed the hosts file and rebooted. I need to resolve this for a paying gig. Help! [more]

Example #1: On this page, scroll down to the EBGames row and click the orange "Buy It' button. I get a connection refusal from "click.linksynergy.com"

Example #2: the Salon day-pass ads. Scroll to the bottom of that Rush article and try to do the "day pass." I get a connection refusal from "cache.ultramercial.com"

Example #3: I cannot get to this link from the Ebates.com main index page (registration required). I get a connection refusal from "www.qksrv.net"

When I say "connection refusal" I mean a "page not found" error message in IE. Firefox actually tells me in an error dialog that the connection was refused by the host.

Now, these are all ad or paid referral sites. So killing off the hosts file was something to try. I apparently have a big ad-blocking hosts file installed by KLite++. I renamed it and rebooted. Is that enough to "turn it off?"

What else should I try? Again, this is for work so any help would be greatly appreciated.

By: malphigian

malphigian — Wed, 26 May 2004 11:27:15 -0800

you should leave the hosts file, but just edit with notepad and clear all the entries but the localhost/127.0.0.1

You don't necessarily need to reboot, popping open a command window and typing:
ipconfig /flushdns

... should do it too.

By: scarabic

scarabic — Wed, 26 May 2004 11:33:44 -0800

Okay - did it.

Drat. Still doesn't work. I think the hosts file must not be involved. The good folks at Salon actually gave me the IP of the ad server and I added it into the hosts file. Didn't help.

Unless I'm looking at the wrong file.

C:\WINNT\HOSTS

That's it, right?

I've reset my IE internet security options to the default. Anything else I should try?

By: andrew cooke

andrew cooke — Wed, 26 May 2004 11:36:05 -0800

mine's in c:\i386 (win2k pro)

By: cmonkey

cmonkey — Wed, 26 May 2004 11:38:25 -0800

Firefox would tell you that it can't find the host if it's a DNS problem.

Open a command prompt and run 'nslookup click.linksynergy.com'. What does it say?

By: scarabic

scarabic — Wed, 26 May 2004 11:44:55 -0800

nslookup says:

Server: ns2.attbi.com
Address: 216.148.227.68

Non-authoritative answer:
Name: click.linksynergy.com
Addresses: 63.123.248.11, 216.35.71.113

By: scarabic

scarabic — Wed, 26 May 2004 11:47:29 -0800

I don't appear to have an i386 directory, although I am on Win2K Pro. I'm running a full search for all files named "hosts" now....

By: majick

majick — Wed, 26 May 2004 11:52:53 -0800

Your hosts file will in all probability be in: C:\WINNT\system32\drivers\etc\hosts.

Any other hosts files you find are not being used.

By: zsazsa

zsazsa — Wed, 26 May 2004 11:54:23 -0800

This is definitely a hosts problem. Those are common hosts blocked by things like the Kazaa Lite installation program. Both c:\winnt\hosts and c:\i386\hosts aren't the right location of your hosts file. It's:
c:\windows\hosts in Win9x and Me, c:\winnt\system32\drivers\etc\hosts in NT4 and W2K, and c:\windows\system32\drivers\etc\hosts in Windows XP.

By: scarabic

scarabic — Wed, 26 May 2004 12:12:12 -0800

I DO see one there, majick. For some reason, my filename search for "HOSTS" didn't it up at first. I must have interrupted it when it *DID* turn up a little ad-blocker I appear to have installed god-knows-when:

C:\Program Files\NoAd HOSTS file

I ran its uninstall and now I can get a Salon day pass :)

I've also cleared the one in
c:\winnt\system32\drivers\etc\hosts

And flushed...

BUT! I still cannot reach the url of the web-tool I need to work. I don't really want to give out that URL, but it's a similar thing. It just times out. I'm connecting to my employer via a VPN. Other people inside their network can reach the tool fine. It's a timeout, not a refusal. I've resolved the host and tried to ping it but pings are all lost. Any suggestions for troubleshoooting that?

By: briank

briank — Wed, 26 May 2004 12:22:13 -0800

Did you try adding an entry for that specific tool in your lmhosts file?

Can you do a traceroute to that tool?

By: scarabic

scarabic — Wed, 26 May 2004 12:32:36 -0800

Traceroute begins to time out after 11 successful hops. What does that say?

I don't think it's a dns issue on this one, actually. I can resolve the host name. I just lose all pings to it.

How would I add an lmhosts entry and what would that do?

By: majick

majick — Wed, 26 May 2004 12:40:45 -0800

"Traceroute begins to time out after 11 successful hops. What does that say?"

That says it's not your problem, unless you administer the network 12 hops away. If you get that far, your end is fine.

By: scarabic

scarabic — Wed, 26 May 2004 12:50:54 -0800

That's what I would think. The weird thing is that I'm tunnelling to my employer's network, and it is the first hop. Theoretically, if it's failing 11 hops after my employer's network, then no one in their office should be able to get there either, right? But they can. Totally whacked. I'm going to have to contact the administrator of the tool and find out if they're blocking me somehow.

You all rock! Thank you!

By: majick

majick — Wed, 26 May 2004 13:11:20 -0800

(My guess is that they're not routing -- or intentionally filtering packets from -- the VPN network to the tool's network. This could be by design, accident, or incompetence.)

By: andrew cooke

andrew cooke — Wed, 26 May 2004 13:29:55 -0800

sorry about that. it appears that the i386 directory is a remnant from the factory install.