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Weird 'DNS' problem

I've got a strange problem.  I have a site where the clients are unable to access www.flickr.com (they use it for research).  The site resolves so DNS appears to be working fine but if I type the address in IE, FF, Safari, etc - the site fails to load.  'Cannot display page' is the generic error among all browsers.  If I put in the resolved IP address - it works fine.  

Any thoughts?
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GDavis193
Asked:
GDavis193
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5 Solutions
 
chapmanjwCommented:
Do you have a proxy server or other web filtering server/software?
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GDavis193Author Commented:
No proxy.  All cleints go straight out.  There is a Sonicwall in place but even if I add flickr.com to a trusted domain - the symptoms remain the same.

It acts like it can't resolve the name - its the same browser error y ou get when DNS fails.  But it resolves.

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chapmanjwCommented:
Does it happen to all the PC's or just one?

What are you using for a router?  Is it a router like you would use at home or is a server acting as the router to get to outside traffic?
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MarkusIdCommented:
Hi,

Which operating system are the clients running on? If it is Windows, what is the output of the dos-command

nslookup www.flickr.com

Does it show the correct IP address?

Best wishes,

Markus
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GDavis193Author Commented:
Yes, it's the IP address I'm plugging into the browser to get to the website.  DNS resolves flickr.com but if I put flickr.com into a browser - it doesn't display the page.  if I put the IP, it works fine.
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GDavis193Author Commented:
It does it from all workstations / servers / macs.  I've used multiple browsers.  We are using a Sonicwall and I've added flickr.com to trusted domains.  

It's weird...
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chapmanjwCommented:
Since you are using Sonicwall, I would give their tech support a call.  There may be an aspect of it's filtering that hasn't been looked at.
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Hypercat (Deb)Commented:
I would try clearing your DNS cache on the server for the flickr.com domain and see if that helps.
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Sudeep SharmaTechnical DesignerCommented:
what do you get if you do telnet to www.flickr.com on port 80?

telnet www.filckr.com 80

what's the output of the command?

Sudeep
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digitapCommented:
Try this...open Internet Explorer and login to the sonicwall website.  From the same workstation, open another IE browser Window and go to Flickr.  What happens?
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GDavis193Author Commented:
@hypercat: I tried ipconfig /flushdns - no go

@SSharma: if I telnet to www.flickr.com 80 then it looks like it hangs.  I hit enter a few times and the cursor drops.  if I hit CTR+C then Enter, I get what looks like HTML code that scrolls across the page.

@digitap: I logged into the Sonicwall Admin Console then went to flickr using another instance of IE - does not work.

I would say it's an IE thing but I've tried this from an XP workstation and a MAC using 3 different browsers with the same result.  Unable to display page.

Waiting for a callback from Sonicwall....

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digitapCommented:
the workstation logged onto the administrator console of the sonicwall bypasses the sonicwall "security" features...by default.  so, it's an easy way to determine if the sonicwall is the culprit.  of course, this feature can be disabled, so....
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GDavis193Author Commented:
thanks
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GDavis193Author Commented:
Oops, I meant to give credit to the post from Chapman on calling Sonicwall as it was actually a Sonicwall problem.
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digitapCommented:
You can Request Attention to your question and you will be allowed to reallocate points.
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