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The message 'Stall Timeout reached' indicates that the parallel page engine (PPE) is unable to retrieve the page metadata. The PPE acts as client requesting information through HTTP. Therefore your middle tier needs to be able to resolve the address of the load balancer.
Does the host name in the portal URL resolve to the load balancer on your middle tiers and can you reach the load balancer at the port specified in the URL from the middle tiers ?
There's the bugger :-)
The metadata indeed needs to be able to call the load balancer URL.
I'm also still puzzled about the following update in this post :
<quote>The middle tiers resolve de load balancer. By example Discoverer or Form on the same middle tier run OK. I have problem with portal only</quote>
Are you able to call the load balancer URL on each midtier ? You can test this with command line HTTP utilities such as wget or simply telnet to the http/https port.
after looking at this, i think you just cant load balance from a load balancer to any of the Portal Middle Tiers similar to Oracle Apps. Portal requires lot more wiring than load balancing.
Have you rewired your portal instance with your load balancer??
Refer this Section