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Login prompt appearing when opening Office documents - 17.Mar.2008 12:00:09 PM

hrsanchez

Posts: 77
Joined: 30.Nov.2007
From: Argentina
Status: offline

Hi,

Each time I open an Office document in a SharePoint library, I have to re-enter my credentials.
I am using Isa server 2006, Sharepoint 2007, Windows Vista ,IE 7.
Using Firefox I dont have the problem.
The problem is only in the Extranet.

I found already some posts around this matter and tried suggestions but it doesnt work.

I added my site to the trusted sites.

I've checked the 'remember my password' option when being prompted for my credentials.

I use NTLM authentication.

Thanks in advanced !

Hector

Post #: 1

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RE: Login prompt appearing when opening Office documents - 18.Mar.2008 6:23:01 AM

Jason Jones

Posts: 2121
Joined: 30.Jul.2002
From: United Kingdom
Status: offline

This is a common issue and occurs because Word (or other non-web apps) is seen as a new session by ISA and hence the authentication cookie provided to the web browser is only valid for that particular web session and not Word; hence the addtional authetication prompt.

The common way to fix the issue is to enable a feature called "persistent cookies" which essentially creates a machine cookie which can be used by ALL applications on the machine. The downside to this approach is that this is not a great security solution if used on non-managed PCs like Internet cafes etc.

A good compromise is to enable persistent cookies only on private computers, this way if the user clicks on the private computer option in the ISA form, they will use persistent cookies, but if they choose public, they will not. The only downside is that if users choose the wrong option (cos they are silly!

) it could mean that a persistent cookie could be applied to a public machine.

The persistent cookies do have a timeout value, so this provides some level of protection and can be modified to meet your paranoia level

Cheers

JJ

_____________________________

Jason Jones (MVP)

Silversands Limited http://www.silversands.co.uk
My Blog: http://blog.msfirewall.org.uk/

Get our NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to hrsanchez)

Post #: 2

RE: Login prompt appearing when opening Office documents - 18.Mar.2008 10:37:16 AM

hrsanchez

Posts: 77
Joined: 30.Nov.2007
From: Argentina
Status: offline

Hi, Jason,

Thanks a lot. I think you are in the right way.
Today, in order to follow your sugestion I found this doc:
http://support.microsoft.com/kb/932118/en-us
I have applied the solution that describe the KB but the problem persists with Excel, Word and Powerpoint. but now Visio documents dont have the problem.
I have to investigate little more...
Regards,

Hector

(in reply to Jason Jones)

Post #: 3

RE: Login prompt appearing when opening Office documents - 18.Mar.2008 11:08:43 AM

Jason Jones

Posts: 2121
Joined: 30.Jul.2002
From: United Kingdom
Status: offline

Think that KB is for another issue, not the one caused by ISA. ISA Server persistent cookies *will* solve you problems, as long as you are happy with the risks...

Persistent cookies are enabled in the Forms=>Advanced tab on the web listener you are using for SharePoint.

Cheers

JJ

< Message edited by Jason Jones -- 18.Mar.2008 11:11:16 AM >

_____________________________

Jason Jones (MVP)

Silversands Limited http://www.silversands.co.uk
My Blog: http://blog.msfirewall.org.uk/

Get our NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to hrsanchez)

Post #: 4

RE: Login prompt appearing when opening Office documents - 18.Mar.2008 11:26:59 AM

hrsanchez

Posts: 77
Joined: 30.Nov.2007
From: Argentina
Status: offline

Hi, Jason,

You are right !
I enabled persistent cookies on the web listener and now the documents open without ask to re-enter credentials.
Thank you very much for your help.

Hector

(in reply to Jason Jones)

Post #: 5

RE: Login prompt appearing when opening Office documents - 18.Mar.2008 11:39:05 AM

Jason Jones

Posts: 2121
Joined: 30.Jul.2002
From: United Kingdom
Status: offline

Cool...just don't be too silly with your timeouts

_____________________________

Jason Jones (MVP)

Silversands Limited http://www.silversands.co.uk
My Blog: http://blog.msfirewall.org.uk/

Get our NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8

(in reply to hrsanchez)

Post #: 6

RE: Login prompt appearing when opening Office documents - 18.Mar.2008 11:59:25 AM