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Weird Internet Browser issue for three Sites

Posted on 2016-08-05
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Medium Priority
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Last Modified: 2016-08-10
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.
0
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Question by:yo_bee
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10 Comments
 
LVL 34

Expert Comment

by:Paul MacDonald
ID: 41744189
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?
0
 
LVL 35

Expert Comment

by:ste5an
ID: 41744231
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?
0
 
LVL 14

Expert Comment

by:kenfcamp
ID: 41744248
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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LVL 23

Author Comment

by:yo_bee
ID: 41744367
@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
0
 
LVL 14

Expert Comment

by:kenfcamp
ID: 41744383
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?
0
 
LVL 11

Expert Comment

by:BillBondo
ID: 41744443
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.
0
 
LVL 23

Author Comment

by:yo_bee
ID: 41744656
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?
0
 
LVL 11

Expert Comment

by:BillBondo
ID: 41744710
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.
0
 
LVL 23

Accepted Solution

by:
yo_bee earned 0 total points
ID: 41744948
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.
0
 
LVL 23

Author Closing Comment

by:yo_bee
ID: 41750099
I found the answer to my issue.
0

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