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connected but no IP

 
 
DBruceM2
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      01-30-2008
I'm at the end of my rope with wireless issue one of my users is
experiencing. I've gone as far as to replace the laptop twice (3
total laptops). The last one is brand new out of the box.

Issue: Wireless networking works while at home office.(WEP enabled)
Wireless networking works when going to a hotel. (regular hotel
wireless portal page w/ access code)
At certain hot-spots, such as airports and other offices, the laptop
can see the open un-secured network, but will not obtain an IP
address. This happens at several airports and several doctors
offices. Some are un-secured, and at least on requires WEP. It's as
if the "physical" network connection is established, but the virtual
connection does not complete. No IP addy is obtained. release and
renew of IP fails, repair of the wireless connection fails. If the
user returns to the hotel or their home office, the wireless works
fine.

Stats: Win XP SP2, internal Dell wireless card (G), User has local
admin, Windows Firewall off, Symantec Corp. ver. 10.x.x.x. No
additional 3rd party firewalls installed.

Is there any plausible explanation as to why the wireless will work in
hotels and at home, but fails to work in a public airport or office?
Please help!
 
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Jim
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      01-30-2008

"DBruceM2" <> wrote in message
news:066d1f0b-f583-4aa1-91e6-...
> I'm at the end of my rope with wireless issue one of my users is
> experiencing. I've gone as far as to replace the laptop twice (3
> total laptops). The last one is brand new out of the box.
>
> Issue: Wireless networking works while at home office.(WEP enabled)
> Wireless networking works when going to a hotel. (regular hotel
> wireless portal page w/ access code)
> At certain hot-spots, such as airports and other offices, the laptop
> can see the open un-secured network, but will not obtain an IP
> address. This happens at several airports and several doctors
> offices. Some are un-secured, and at least on requires WEP. It's as
> if the "physical" network connection is established, but the virtual
> connection does not complete. No IP addy is obtained. release and
> renew of IP fails, repair of the wireless connection fails. If the
> user returns to the hotel or their home office, the wireless works
> fine.
>
> Stats: Win XP SP2, internal Dell wireless card (G), User has local
> admin, Windows Firewall off, Symantec Corp. ver. 10.x.x.x. No
> additional 3rd party firewalls installed.
>
> Is there any plausible explanation as to why the wireless will work in
> hotels and at home, but fails to work in a public airport or office?
> Please help!

It would be useful to compare the results of ipconfig/all under both
examples.

Jim


 
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Jack \(MVP-Networking\).
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      01-31-2008
Hi
Many times connected means that there is signal that can be received, but it
does not necessarily mean that you have the correct credentials and that you
are allowed to logon to the network.
In the situations that you described you need to get permission and the
credential settings from the person in charge of the Network.
Most Wireless connections are Not an open door that every one can barge in
uninvited.
Jack (MVP-Networking).

"DBruceM2" <> wrote in message
news:066d1f0b-f583-4aa1-91e6-...
> I'm at the end of my rope with wireless issue one of my users is
> experiencing. I've gone as far as to replace the laptop twice (3
> total laptops). The last one is brand new out of the box.
>
> Issue: Wireless networking works while at home office.(WEP enabled)
> Wireless networking works when going to a hotel. (regular hotel
> wireless portal page w/ access code)
> At certain hot-spots, such as airports and other offices, the laptop
> can see the open un-secured network, but will not obtain an IP
> address. This happens at several airports and several doctors
> offices. Some are un-secured, and at least on requires WEP. It's as
> if the "physical" network connection is established, but the virtual
> connection does not complete. No IP addy is obtained. release and
> renew of IP fails, repair of the wireless connection fails. If the
> user returns to the hotel or their home office, the wireless works
> fine.
>
> Stats: Win XP SP2, internal Dell wireless card (G), User has local
> admin, Windows Firewall off, Symantec Corp. ver. 10.x.x.x. No
> additional 3rd party firewalls installed.
>
> Is there any plausible explanation as to why the wireless will work in
> hotels and at home, but fails to work in a public airport or office?
> Please help!


 
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DBruceM2
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      01-31-2008
Jack,
Thanks for the reply.
I completely understand what you're saying about barging in, but these
are all networks in which she has been cleared to connect to or are
simply public hot-spots in an airport... furthermore, a small number
appear as un-secured connections. This tells me no WEP or WPA is
enabled. Sure there could be MAC filtering set up, but for the sites/
hotspots she's visiting, it's highly improbable that this has been
implemented. Many of these sites (doctors offices), the user has
been given permission to access the wireless network. In several
cases, she has been given the WEP key (where applicable). The offices
know that she's there and need her to use the wireless. As for the
public airport connections, any user would need to grab an IP on the
wireless network before they can hit their respective log-in portal
pages and/or https site to enter any credentials or credit-card info.
It is these kind of hotspots that have me puzzled. I'm willing to
concede that perhaps these hotspots are down for a day here and there,
but the issue is that it's the same airports and offices... and this
has been happening for over a month.


Jim,
I'll see if I can get her to send me some screenshots of the /all
command. Is there anything peculiar I should be looking for?


On Jan 30, 8:33 pm, "Jack \(MVP-Networking\)."
<j...@discussiongroup.com> wrote:
> Hi
> Many times connected means that there is signal that can be received, but it
> does not necessarily mean that you have the correct credentials and that you
> are allowed to logon to the network.
> In the situations that you described you need to get permission and the
> credential settings from the person in charge of the Network.
> Most Wireless connections are Not an open door that every one can barge in
> uninvited.
> Jack (MVP-Networking).
>

 
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Barb Bowman
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Posts: n/a
 
      01-31-2008
http://digitalmediaphile.wordpress.c...t-text-output/

On Thu, 31 Jan 2008 06:52:49 -0800 (PST), DBruceM2
<> wrote:

>I'll see if I can get her to send me some screenshots of the /all
>command. Is there anything peculiar I should be looking for?

--

Barb Bowman
MS Windows-MVP
http://www.microsoft.com/windowsxp/e...ts/bowman.mspx
http://blogs.digitalmediaphile.com/barb/
 
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Jack \(MVP-Networking\).
Guest
Posts: n/a
 
      01-31-2008
Hi
I doubt that a solution can be found without knowing the specific parameters
of the Networks that she cannot connect to.
Many closed Network can appear on the screen as opened (insecure) but you
can log on unless you know a certain sequence given by IT,
WEP key if given in a form of passphrase might not work (
http://www.ezlan.net/faq.html#wep ).
Could be that the computer's Firewall, or Host file block certain subnets,
in "desperation" I would uninstall the 3rd party Firewall too.
I would start in a small office (like a medical office where I can interact
easily with other people the use the network) bring with me a second laptop
(or at least disable the internal wireless and try a PCMCIA card) and ask
about the office's IP and the specific parameters of the Network.
Jack (MVP-Networking).

"DBruceM2" <> wrote in message
news:1a9931d3-502e-49a1-be56-...
> Jack,
> Thanks for the reply.
> I completely understand what you're saying about barging in, but these
> are all networks in which she has been cleared to connect to or are
> simply public hot-spots in an airport... furthermore, a small number
> appear as un-secured connections. This tells me no WEP or WPA is
> enabled. Sure there could be MAC filtering set up, but for the sites/
> hotspots she's visiting, it's highly improbable that this has been
> implemented. Many of these sites (doctors offices), the user has
> been given permission to access the wireless network. In several
> cases, she has been given the WEP key (where applicable). The offices
> know that she's there and need her to use the wireless. As for the
> public airport connections, any user would need to grab an IP on the
> wireless network before they can hit their respective log-in portal
> pages and/or https site to enter any credentials or credit-card info.
> It is these kind of hotspots that have me puzzled. I'm willing to
> concede that perhaps these hotspots are down for a day here and there,
> but the issue is that it's the same airports and offices... and this
> has been happening for over a month.
>
>
> Jim,
> I'll see if I can get her to send me some screenshots of the /all
> command. Is there anything peculiar I should be looking for?
>
>
> On Jan 30, 8:33 pm, "Jack \(MVP-Networking\)."
> <j...@discussiongroup.com> wrote:
>> Hi
>> Many times connected means that there is signal that can be received, but
>> it
>> does not necessarily mean that you have the correct credentials and that
>> you
>> are allowed to logon to the network.
>> In the situations that you described you need to get permission and the
>> credential settings from the person in charge of the Network.
>> Most Wireless connections are Not an open door that every one can barge
>> in
>> uninvited.
>> Jack (MVP-Networking).
>>


 
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