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Unable to view some pages... - 9.Nov.2005 8:01:00 PM

thecoffeeguy

Posts: 165
Joined: 28.Aug.2005
Status: offline

I setup a HTTP and HTTPS outbound rule for my users. In there, I have checked all the content types EXCEPT video and audio, as I don't want people streaming.

One thing i've noticed is that some web pages are not being displayed (a blank page appears when something should apear.) Yet,if I go back into the HTTP rule, check "all content types", view the webpage again, it works.

The website ends with .asp.

Here is the link: (don't know if you can get there)

http://www.lsiflood.com/NewOrder.asp

Do I need to add some specific content for this to display properly? If so, which category do I add it too?

Cheers,

jason

Post #: 1

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RE: Unable to view some pages... - 9.Nov.2005 11:56:00 PM

ClintD

Posts: 1833
Joined: 26.Jan.2001
From: Keller, TX
Status: offline

I believe you'll have to go into the pre-existing Content Type for Text and add an entry for "text/css" as this is returned numerous time when I looked in a sniff for my IE client requesting this URL.

The default "library" for Text only includes an entry for .css, but the web server is returning text/css for these requests.

Since this isn't in the list, I think ISA is taking a "if I don't know what it is, and not "All Content Types" are allowed, I'm going to deny it" stance.

If you run into this again with other sites, take a trace from the ISA Server on the outside interface.

If you have MS' NetMon, go into Display\Filter -> Add Expression -> Property Tab -> HTTP\Content Type "Exists"

If you're using Ethereal, go to Analyze\Display Filter -> next to the Filter String field, hit Expression. Find HTTP and look for http.content_type and specify "Exists" to the right

In the responses from the web server, look in the Content Type header to see what's being returned and see if it fits any of the predefined options in ISAs content type definitions - this can take some work.

If it's SSL, you're kinda SOL. [Razz]

[ November 10, 2005, 12:05 AM: Message edited by: ClintD ]

(in reply to thecoffeeguy)

Post #: 2

RE: Unable to view some pages... - 10.Nov.2005 12:11:00 AM

ClintD

Posts: 1833
Joined: 26.Jan.2001
From: Keller, TX
Status: offline

Crap - text/css is included under the HTML Documents Content Type. Sorry about that...

All the remaining requests are text/html, image/gif or image/jpg Content Types.

Can you look under the Monitoring\Logging and see what is being logged for the request? We should be able to see the portion that gets rejected (like a "Rejected by the HTTP security filter" or something along those lines.

This looks interesting -
MS KB Article 895202 - You may receive a blank page when your browser submits a POST request to an ASP Web page through ISA Server 2004. This is a Post ISA SP1 hotfix.

Do you receive a blank page when you go to the URL, or only when you submit credentials?

[ November 10, 2005, 12:33 AM: Message edited by: ClintD ]

(in reply to thecoffeeguy)

Post #: 3

RE: Unable to view some pages... - 14.Nov.2005 10:37:33 PM

thecoffeeguy

Posts: 165
Joined: 28.Aug.2005
Status: offline

quote:

ORIGINAL: ClintD

Crap - text/css is included under the HTML Documents Content Type. Sorry about that...

All the remaining requests are text/html, image/gif or image/jpg Content Types.

Can you look under the Monitoring\Logging and see what is being logged for the request? We should be able to see the portion that gets rejected (like a "Rejected by the HTTP security filter" or something along those lines.

This looks interesting -
MS KB Article 895202 - You may receive a blank page when your browser submits a POST request to an ASP Web page through ISA Server 2004. This is a Post ISA SP1 hotfix.

Do you receive a blank page when you go to the URL, or only when you submit credentials?

[ November 10, 2005, 12:33 AM: Message edited by: ClintD ]

No worries.
Sorry it took me so long to reply. been very busy.

Get the blank page after I submit credentials.

I'll poke around in my logs, see if I can dig up more info.

(in reply to ClintD)

Post #: 4