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web site blockingthis thread has 6 replies and has been viewed 696 times
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#1
16th June 2012, 16:31
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web site blocking
Hi ,
we are facing the strange issue . we are unable to open a spefic web site in our office , and that web site is working fine from the company near us. we both are using the same isp connection. If i attach the differant isp connection in my office , its working fine. If their is a problem with particular ISP then it should not open that site from our neighbour company , which are using the same isp. If there is a virus problem in my office , then it should not open with other isp in my office. what can be the issue.  please help... Thanks... |
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#2
16th June 2012, 17:42
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Re: web site blocking
Why should it be a virus?
Do you use any sort of proxy server in your office? What do you mean by "attach the different isp connection"?
__________________
Tom Jones MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+ PhD, MSc, FIAP, MIITT IT Trainer / Consultant Ossian Ltd Scotland ** Remember to give credit where credit is due and leave reputation points where appropriate ** |
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#3
16th June 2012, 19:35
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Re: web site blocking
Do you get page can't be displayed? Could be a dns issue. What dns servers are you using for external lookups? If your running dns internally have you tried deleting the cache on the dns server? Could have a stale record. Also like Ossian said, are you going through a proxy or some sort of filtering for your web traffic?
__________________
CCNA, CCNA-Security, CCNP CCIE Security (In Progress) |
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#4
16th June 2012, 20:23
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Re: web site blocking
Start by troubleshooting this with some DNS tools such as NSLOOKUP.
From a computer having this issue open the command prompt, type NSLOOKUP, hit enter, then type in the host name. Is the host name resolved? If so, try a TRACERT. exit from NSLOOKUP, from the command prompt, type TRACERT hostname. hit enter. Results?
__________________
JM @ IT Training & Consulting http://www.itgeared.com |
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#5
18th June 2012, 16:46
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Re: web site blocking
Hi ,
I already tried nslookup . If i put the dns provided from my isp ...its unable to resolve the name i need. but if i put open dns as 4.2.2.2 and 8.8.8.8 it resolves the name and ip ...but even though its not opening the web page for me. I am using a sonicwall tz 100 . i tried to open that site by bypass it but its not opening. so is this issue from isp ? If its from isp then why its opening from my neighbor company , which uses the same isp connection . Thanks |
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#6
18th June 2012, 19:25
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Re: web site blocking
Are you using any sort of cloud filtering solution? Are you running dns internally or just using public dns for your hosts?
__________________
CCNA, CCNA-Security, CCNP CCIE Security (In Progress) |
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#7
19th June 2012, 01:33
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Re: web site blocking
Have you checked your firewall logs for outbound traffic to see if something is being blocked?
Did you try the tracerts?
__________________
JM @ IT Training & Consulting http://www.itgeared.com |
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