[Building Sakai] Unexpected login prompts - Sakai 2.6.0

[Grossman,John E]

We are running a CSS load balancer with two Sakai instances. The Sakai instances are not cluster aware.
The CSS is configured for SSL sticky sessions as we use SSL for all traffic to Sakai. This is based on the SSL Session ID (not the Sakai session ID).

We did suspect the load balancer, but the odd thing is that when you get this unexpected prompt to authenticate, you can generally re-enter your Sakai session with no problems. If the load balancer were sending you to the wrong server, it seems like you wouldn't be able to re-enter the Sakai session because the session would only exist on the original server. Am I misunderstanding Sakai sessions?

John

-----Original Message-----
From: sakai-dev-bounces at collab.sakaiproject.org [mailto:sakai-dev-bounces at collab.sakaiproject.org] On Behalf Of Zach A. Thomas
Sent: Monday, June 14, 2010 5:16 PM
To: sakai-dev at collab.sakaiproject.org
Subject: Re: [Building Sakai] Unexpected login prompts - Sakai 2.6.0

This is consistent with a cluster environment where the load balancer
does not properly "stick" the user to a single server. Thus, they're
logged in on one of the nodes, but the next request goes to some other
server where they're _not_ logged in.

Can you confirm whether you are running a cluster of app servers? And if
so, how are you performing load balancing?

cheers,
Zach Thomas
Owner, Aeroplane Software LLC

On Sat, 2010-06-12 at 17:10 -0500, Grossman,John E wrote:
> We periodically have a problem where a user is in the system working
> (constant activity – not a timeout issue) and Sakai unexpectedly
> prompts for user name and password. A variation on this is that Sakai
> will prompt several times. The correct credentials are entered several
> times and then the mangled screen shown shown below appears. The log
> shows this:

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