"2Sweet" <firstname.lastname@example.org> wrote in message
> My laptop is running Windows Vista Business Edt SP1.
> It shows the error "Internet Explorer cannot display the page." on the
> Same laptop access from other internet or using home internet no problem.
> How to check whether the company IP is blocked?
Normally you can't. If that is what is being done, then it may well just
look like a hop on the route is not responding.
You can use tracert from a command prompt to see what is responding, compare
them between your office connection and at home. eg.
Tracing route to app-prd.ofs.edu.sg [126.96.36.199]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 10.1.10.1
2 9 ms 8 ms 8 ms ip129.net92-244-171.ci-net.com
3 8 ms 8 ms 10 ms ip46.net195-72-174.as8844.net
4 7 ms 8 ms 7 ms gi5-1.r1.thn.core.as8844.net [188.8.131.52]
5 8 ms 8 ms 8 ms ge-4-2-0.gar1.lon2.level3.net
6 9 ms 12 ms 18 ms ae-31-51.ebr1.london2.level3.net
7 16 ms 17 ms 18 ms ae-45-105.ebr2.london2.level3.net
8 8 ms 8 ms 8 ms ae-3-3.ebr1.london1.level3.net
9 8 ms 8 ms 9 ms ae-100-100.ebr2.london1.level3.net
10 77 ms 77 ms 77 ms ae-42-42.ebr1.newyork1.level3.net
11 80 ms 89 ms 91 ms ae-61-61.csw1.newyork1.level3.net
12 91 ms 89 ms 90 ms ae-64-64.ebr4.newyork1.level3.net
13 159 ms 146 ms 159 ms ae-2-2.ebr4.sanjose1.level3.net
14 151 ms 147 ms 158 ms ae-84-84.csw3.sanjose1.level3.net
15 147 ms 147 ms 147 ms ae-3-89.edge6.sanjose1.level3.net
16 370 ms 368 ms 368 ms starhub-ltd.edge6.sanjose1.level3.net
17 290 ms 290 ms 290 ms vlan905-an-cat6k-ts1-r1.starhub.net.sg
18 293 ms 292 ms 289 ms shiatl5.starhub.net.sg [184.108.40.206]
19 292 ms 293 ms 292 ms 220.127.116.11
20 292 ms 293 ms 291 ms app-prd.ofs.edu.sg [18.104.22.168]
So from this, I can see that I get a response at the ICMP level from the
site at hop 20, after having traversed from my office PC via an internal
router, then from the ISP to London, across the Atlantic to New York, then
to San Jose, over to the Starhub network in Singapore, and then through to
the Overseas Family School server.
If you can trace all the way to the server from the office but still cannot
get onto the site, then I can think of a few things that might be happening:
application level blocking at ofs.edu.org prevents HTTP traffic from your
IP; application level blocking in Starhub is blocking access; your company
ISP is blocking access; your company is blocking access. There could be
other things going on, but those are the most likely. Post your tracert
results from both locations and I'll try to tell you what's going on if you
> "Dan" <email@example.com> wrote in message
>> "2Sweet" <firstname.lastname@example.org> wrote in message
>>> I have no problem surfing internet. But i cannot access only
>>> www.ofs.edu.sg in the office. At home no problem.
>>> How to troubleshoot such problem?
>> No problems here. What do you see? It could be that they restrict access
>> by IP, or that there's some sort of connectivity issue between your
>> office ISP and the site. It could also be a hundred other things, you've
>> given nothing to go on. Windows and IE versions? Add-ons installed? Does
>> it work in No-Addons mode? If you use Fiddler2 does the site respond?