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Webpages Cannot Be Displayed

Hi All

We got a call from a client who is experiencing issues accessing web pages. They are running a SBS 2008 environment and are frequently presented with "page cannot be displayed" when searching google etc, other times accessing the same site will work fine. We know it's not a connectivity issue as their connection has been up for weeks as we can tell via the routers uptime. The strange thing is that when a user is presented with the error, they are able to ping external sites so I know connectivity is fine.  All apears fine server side however we noticed that there were no DNS forwarders configured. We have since added them however have not heard back from the client as it was Friday evening when we made the change.

I was just wondering if the lack of forwarders could cause the issue and if there are any other things I should be checking server side.

Thanks
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Daniel Bertolone
Asked:
Daniel Bertolone
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1 Solution
 
Praveen Kumar BonalaCommented:
your connectivity may be fine, but pocket drops, flaps or breaks will cause this issue.

please open command prompt from client machine...

type: ping google.com -t

open another command prompt

type: ping <gateway IP> -t

open another command prompt

type: ping <dns IP> -t

run all above three for long time like 1 hour or 2 hours and check is there any pocket lost or drops in any of above to

depend upon result we can troubleshoot.
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UnHeardOfCommented:
Check to make sure the clients configured DNS servers are up and running. Test with nslookup to make sure they are resolving.
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duzbinCommented:
I have experienced this issue before as well, and adding the DNS forwarders did the trick, the DNS Service in SBS does sometimes need a reboot causing the issue above, i doubt you will have any further issues.
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Cris HannaCommented:
This is a well documented issue with SBS 2008 and SBS 2011
http://blogs.technet.com/b/sbs/archive/2009/01/29/cannot-resolve-names-in-certain-top-level-domains-like-co-uk.aspx

So you can add the DNS forwarders or you mod the registry or both
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Daniel BertoloneAuthor Commented:
Thanks for the feedback guys…

I added the DNS forwarders on Friday and asked the client today for an update and they advised they are still experiencing the issue. I have since read the article and modified the registry however is there anyway of me knowing what my client is actually true?

Prior to adding the forwarders the client did send me a screen shot of what they are seeing however I need to be certain what the client is telling me is actually true as from what I read adding the forwarders should solve the issue. Now I am hoping the registry modification will do the trick however because the issue is intermittent I am reliant on what the client is telling me. Are there no logs either on the workstation’s or server that would prove what they are telling me is actually happening?

Thanks
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Cris HannaCommented:
Did you restart the DNS service after making the changes?
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Daniel BertoloneAuthor Commented:
yes, I also restarted the server to make sure..
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Cris HannaCommented:
what did you use for DNS forwarders
what kind of firewall/router is in place?   Are DNS servers listed there as well?
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Daniel BertoloneAuthor Commented:
Google & OpenDNS. Client has a Draytek router & no DNS servers are listed in the config as the router detects them automatically from the ISP, do you think we should be entering DNS servers in the router as we have many clients with the same setup without issue.
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Cris HannaCommented:
Assuming that your client has a static IP from the ISP, they will not get DNS information.   I always add DNS to my routers

As for your forwarders, I would go with JUST google, OR just OpenDNS....not both.
then just restart the DNS Server Service
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Daniel BertoloneAuthor Commented:
When I log into the routers interface it shows the two DNS servers that are currently active on the ISP's connection. I will look to add Google's DNS on the server & router & remove others so that the setup is clean and report back.
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Daniel BertoloneAuthor Commented:
I have added modified the forwarders on the SBS server to only include google however the client has emailed me a screenshot today showing the exact same issue. I am starting to run out of ideas as everything looks as should be on the sever.

I have checked one of the clients and flushed DNS, the network config I set to DHCP and obtains the correct details from the server.
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UnHeardOfCommented:
Can you run debug on Nslookup and post your findings  so we can see the issue?
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Daniel BertoloneAuthor Commented:
Nslookups appear to be resolving OK in all cases but obviously we cannot be 100% certain.  I am now going to try the ping commands mentioned above and see what happens.
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Daniel BertoloneAuthor Commented:
Ping results attached, to me they look fine?
dns.txt
gateway.txt
google.txt
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Daniel BertoloneAuthor Commented:
Hi all

Issue turned out to be malware infection on the PC'S.

Thanks for the assurance.
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Daniel BertoloneAuthor Commented:
Issue was self resolved.
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