> Has anyone used CAS in multiple server environments?

I think lots of folks are doing HA CAS.  We are.

> What keeps the tokens unique?

The server.name parameter in the cas.properties file.  That string is
appended to the end of the service ticket by default to further
guarantee globally unique ticket strings.

> is there any good articles on mutiple CA servers using the same token (high 
> availability).

http://www.ja-sig.org/wiki/display/CASUM/Clustering+CAS is a good
starting point.  I think searching the cas-user and cas-dev list
archives for "HA" and "Cluster" would provide further details after
you have a general understanding of the concerns involved in a HA CAS
setup.

M

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