Weird Internet Browser issue for three Sites

I have a weird one I cannot pin point.  I have three sites that users are trying to get to via my network.
No matter what browser I use I am not able to get the site up.

steps taken so far.
  • NSLOOKUP from my machine resolved successfully
  • PING site successfully
  • MXTOOLBOX site resolved the same results as my nslookup
  • Successfully got to the site from a mobile device off the network
  • Used a Proxy Server website and resolved successfully

Are there any DNS Server logs or debugging method that I can use to try and isolate the cause.
LVL 26
yo_beeDirector of Information TechnologyAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
Do you use a proxy?

Are these sites all on the same subnet?

What error message do you get when the site doesn't display?
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ste5anSenior DeveloperCommented:
What does "No matter what browser I use I am not able to get the site up." mean?

Have used nslookup, ping, traceroute/tracert on those machines? Have those machines special firewalls settings or default proxies for the browser?
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kenfcampCommented:
Can you access the sites by IP?

Are you using residential or business class internet service?
(port blocking may be in play)

Do you have a firewall that could be blocking traffic?
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yo_beeDirector of Information TechnologyAuthor Commented:
@paulmacd
No Proxy, Subnets are all different, Error "This Page Can't be displayed"

@Ste5an
No matter what browser I use I am not able to get the site up
Means IE, Firefox and Chrome all are unable to bring the site up.  They all error out.  

steps taken so far.

•NSLOOKUP from my machine resolved successfully
•PING site successfully
•MXTOOLBOX site resolved the same results as my nslookup
•Successfully got to the site from a mobile device off the network
•Used a Proxy Server website and resolved successfully

You are asking questions that I have already put up
Have used nslookup, ping, traceroute/tracert on those machines
TraceRT resolved nothing
No Firewalls

@kenfcamp
Unable to get the sites up via IP either
Commercial level ISP (Cogent 100 MB up/down)
ASA Firewall is not blocking the sites
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kenfcampCommented:
what are you hosting on? (Windows, Linux, etc)

I'm sure you have, but I have to ask. Have you verified your HTTPD service is running?

Have your checked your logs for errors?
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BillBondoCommented:
Had similar issue the other day. We have 2 isp's and going thru our main isp we could not get to a certain site. We routed traffic for just this one site thru our second isp and worked fine. This was done by our sonic-wall. Next day before calling main isp I did some testing and for what ever reason it was working.
Also another site was acting the same way but cleared itself as well later on.
I never was able to confirm but seems as if our isp was to blame.
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yo_beeDirector of Information TechnologyAuthor Commented:
I called my ISP and they were able to successfully access the site.  
So I chalked it up to something in my system, but it could be an ISP issue.
Who do you use?
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BillBondoCommented:
LightTower is the one giving us the issue and it just happened again, same site too.  We have Cablevision as well so from our SonicWall I redirected traffic for that site out that port. With them no issue.  So its deff outside our network.
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yo_beeDirector of Information TechnologyAuthor Commented:
Found the cause.

We recently implemented a IPS and they enabled a feature called Country Killer.  All the sites that the users were going to were on the top 20 list (China, India, Spain).

The reason one of the sites worked today was because it was whitelist yesterday, but it took a little time for it to apply.

I disabled the feature for now and all site were accessible.

Thanks for all your help guys.
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yo_beeDirector of Information TechnologyAuthor Commented:
I found the answer to my issue.
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