unable to access some websites (yahoo in particular)

I ran a firmware upgrade of a Sonicwall TZ100W from 5.8.1.5 to 5.8.1.13 and now have issues loading some webpages from the lan. I can tracert to yahoo.com and ping same but when opening a browser, the browser just states 'connecting' and never loads page. I can however get to sports.yahoo.com with no issues.

On the sonicwall, I have now turned off all Security services etc and still no joy.
I have set DNS on the server to OpenDNS as well as ISP dns

Another oddity is if I go to abcnews.go.com, the browser loads the header of the page in the browser title bar but then will not load anything else (even after clearing browser cache and resetting browser to defaults).
I can browse many other pages no problem google, msn, bbc, etc
cyansolutionsAsked:
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cyansolutionsConnect With a Mentor Author Commented:
Final resolution was to scrap config and reconfigure firewall with new firmware. This was the quickest solution that Sonicwall would supply me as the appliance was out of support.
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Blue Street TechLast KnightsCommented:
Hi cyansolutions,

I'd recommend upgrading to SonicOS 5.9.0.2.

Do you have DNS Rebinding Attack Prevention (Network > DNS) enabled? If so, what is the action set to?

DNS does not function as one would think...it does not try in the order set, e.g. DNS 1, then DNS 2, then if fails try DNS 3. But rather whichever DNS server responds quickest will be the answering server. So typically your ISP is the fastest responding, therefore if you want to test them set only one. then go on the PC and on the command line type ipconfig /flushdns, then re-test and repeat the process each time with a single new DNS server entry.

Check CGSS (AV, AS & IPS) along with Content Filtering Service (CFS) and App Control to make sure it's not being blocked by either security service.

Let me know how it goes!
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cyansolutionsAuthor Commented:
I've requested that this question be deleted for the following reason:

Issue resolved with tech support assistance
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Blue Street TechLast KnightsCommented:
How did they resolve it?
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Blue Street TechLast KnightsCommented:
At least provide the answer so that it will benefit others and select it as your answer!

I don't understand why you would post this question, and not respond, and then call tech support.
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Blue Street TechLast KnightsCommented:
OK, thanks for getting back to me! Next time hopefully we'll have some dialogue so we can get this answered for you!

Take care!
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