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Norton Internet Security blocks some of my ASP.NET pages
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Chris Zoper
Hello,

Norton Internet Security blocks some of my ASP.NET pages. The pages are
very 'normal' pages though. There is no 'dangerous' code in it or
something like that. Also, the page is not in a pop-up. Most of my pages
work just fine, but when I navigate to a specific page, it won't open. I
don't get an exception or a warning, the page just won't finish loading.
When I disable Norton Internet Security, it works fine again.

Also when I set the page as the start-page of my ASP.NET project, the
page just won't load.

Does anyone know what can cause this problem?

Greetings,
Chris.

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Curt_C [MVP]
you just said it... Norton.
Sounds like the DESKTOP version of Nortom has issues when trying to run in a
SERVER type environment.
Disable script blocking and just leave it like that.

--
Curt Christianson
Owner/Lead Developer, DF-Software
Site: http://www.Darkfalz.com
Blog: http://blog.Darkfalz.com

"Chris Zoper" <Click here to reveal e-mail address> wrote in message
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Ted Harper
On Thu, 09 Sep 2004 08:02:51 -0700, Chris Zoper
<Click here to reveal e-mail address> wrote:

[Original message clipped]

We had a similar problem with NIS and our ASP.Net application.
Specifically on our General Manager's XP Pro laptop, which he uses for
product demos with the application installed locally, if NIS is
enabled, then just a _couple_ of the dynamic images (ie *.ASPX pages
outputting dynamic image/png charts) fail to load - red X in browser,
nothing logged anywhere, no exception thrown in our code. That is, two
out of about 30 of these pages (all using the same base class and
output mechanism) are blocked/broken when NIS is enabled.

I don't know if this relates to your experience at all with your
ASP.Net (presumably text/html) pages, but it is only the _largest_ two
of our dynamic charts (heights of about 7000 pixels and 20000 pixels
respectively - displayed in a scrolling DIV) which this issue happens
with, and ONLY when the app is locally hosted (ie the same build of
the code works perfectly when accessed from his laptop over our
intranet or over the net), and not reported by any of our cllients in
any of their "normal" server->client use. Perhaps NIS blocks or has
some overflow when scanning really large locally-sourced (ie
"outgoing") streams, or ones that are generated more slowly, or
something mysterious like that?

As you've described, simply disabling NIS and refreshing the page
makes it work normally, and re-enabling it and refreshing again repros
the problem 100% repeatably (but always only on the same
pages/images).

Aside from the above I can't offer any explanation at all as to why
just two pages out of our entire app would be affected by NIS (and
also why it seems only a problem with local/loopback use of the
ASP.Net app with NIS, not when the same laptop accesses the same
application on a server). We ended up simply taking the advice of
Symantec and Microsoft that NIS and IIS just don't get on (IIS is for
servers, NIS is for workstations), and our GM is now using NAV
together with the XPSP2 firewall and no problems at all.

ted.h.
--
Ted Harper (Sydney, Australia)
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Rich G (VIP)
We were getting similar issues from users who were using Norton Internet
Security or Zone Alarm.

In our case, we had to quit using the HttpRequest.UrlReferrer property in
our pages. Norton and ZoneAlarm strip that out of the Request header so it
is not available and you cannot rely on it in your code.

"Chris Zoper" wrote:

[Original message clipped]
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Karl
You shoulnd't rely on UrlReferrer anyways..but yes, Norton will strip it
out.

Zone Alarm doesn't play nice with forms authentication (it'll block the
cookie, but not other ones).

Anyways, such behaviour is pretty common with software firewalls and there's
typically little that can be done (short of shutting it off)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

"Rich G" <Click here to reveal e-mail address> wrote in message
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Kevin Spencer
Just an observation: Norton is arguably the best anti-virus software on the
market (at least it is the most popular), and it sucks, in a word.
Considering how important and costly Internet security is, you would think
SOMEBODY out ther would author a non-invasive anti-virus software package.
My guess is, whoever can do so will own the market.

--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
I get paid good money to
solve puzzles for a living

"Karl" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net> wrote in
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Karl
Is that a business proposition ;)

Karl

--
MY ASP.Net tutorials
http://www.openmymind.net/

"Kevin Spencer" <Click here to reveal e-mail address> wrote in message
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> Just an observation: Norton is arguably the best anti-virus software on
the
[Original message clipped]
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System.Web.HttpRequest




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