Re: Is it a DNS problem?

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Hi Greg,

I did the telnet command and can connect to all four of their dns servers in
an instant. We have a dsl line the we use for testing from the same ISP and
we can get to Clearchannel websites. So I'm assuming that our ISP can get
to their websites as well. Will probably give them a call and ask anyway.

Back to the telnet command, since I can connect to their dns, is there
anything else I should try? Thanks for your assistance!


Richard




"Greg Lindsay [MSFT]" <greglin@xxxxxxxxxxxxx> wrote in message
news:OJk19$$ZHHA.5032@xxxxxxxxxxxxxxxxxxxxxxx
That is probably a result of the DNS timeout.

Try a telnet to port 53. If you just time out, then either there is a
firewall blocking you, or a routing problem. See below for an example.

C:\>telnet dns1.clearchannel.com 53

-- or --

C:\>telnet 207.230.136.193 53

When I do this, it connects and then the screen clears. To disconnect, hit
return.

If it just sits trying to connect, this is usually a firewall or access
list blocking the source or destination. It could also be a routing
problem, but this is less probable. I tried to verify routing to this DNS
server, but ICMP is blocked along the path. I would at least check routing
with tracert to make sure you can get off your LAN when you try to
traceroute to clearchannel.

It may still be a blacklist, but one that is used by an ISP between you
and clearchannel. It might be a good idea to call your ISP's support and
ask if they can get to clearchannel. If they don't have a problem, this
would narrow it down quite a bit.

--
Greg Lindsay [MSFT]

Disclaimer: This posting is provided "AS IS" with no warranties, and
confers no rights.

"Richard" <rdumag@xxxxxxxxxxx> wrote in message
news:OQf5PV$ZHHA.208@xxxxxxxxxxxxxxxxxxxxxxx
Hi Greg,

I called Clearchannel and they said our ip address is not on their
blacklist. So the ball is back on our end. One thing I noticed on our
dns servers is that eventhough there are entries in the cached lookups
for their sites, they only show dns info....nothing for host(A). Other
cached lookups show both dns and host info.

Any idea? Thanks!


Richard




"Richard" <rdumag@xxxxxxxxxxx> wrote in message
news:eLVHYQ1ZHHA.4396@xxxxxxxxxxxxxxxxxxxxxxx
Thanks Greg. Yes, we can browse and do nslookup from a different ip. I
have Clearchannel's contact info so I'll give them a call. Thank again!





"Greg Lindsay [MSFT]" <greglin@xxxxxxxxxxxxx> wrote in message
news:ex$LzpzZHHA.1220@xxxxxxxxxxxxxxxxxxxxxxx
Hi Richard,

The most likely problem is that your IP address range is on a blacklist
that Clearchannel is using. A way to test this would be to try to
nslookup or browse to those web sites from a different IP address.

--
Greg Lindsay [MSFT]

Disclaimer: This posting is provided "AS IS" with no warranties, and
confers no rights.

"Richard" <rdumag@xxxxxxxxxxx> wrote in message
news:uLHHCDyZHHA.4000@xxxxxxxxxxxxxxxxxxxxxxx
We have internal and external dns servers (2003). We can browse and
do nslookup on any sites except for sites that are hosted by
"clearchannel.com".

Clearchannel has the following dns and web servers and they host many
radio and tv stations on the same web servers:

dns servers:
dns1.clearchannel.com
dns2.clearchannel.com
ns1.clearchannel.com
ns2.clearchannel.com

web servers:
207.230.150.254
207.230.154.254
207.230.156.254

Here are some of their sites that we cannot get to:
www.kbig104.com
www.foxsports610.com
www.y92.com
www.talk960.com


When we do an nslookup we get the following:
DNS request timed out.
timeout was 2 seconds.

We can get to their sites using our separate dsl line that we use for
testing.

We have no filtering set in our firewall for their ip addresses.
Could this be an issue with our dns? Any help is appreciated.
Thanks!

Richard














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