SSO issues with upgrading servers but not clients

I am busy doing a upgrade for a client -- nine mail servers and five application servers. They are in the process of moving to the Web with their applications. They don't want to upgrade the Notes clients, but would like to upgrade all the servers and include single sign-on.
  1. I would appreciate any suggestions (procedures) or tips or what to be careful of.
  2. Can we upgrade the mail servers but keep the clients on 5.0.9 and the application servers 5.0.12?
  3. If we upgrade the Domino Directory but keep the clients on R5, will single sign-on be affected?

You should not have any issues upgrading your servers and keeping the clients at a prior version. Obviously, you will need to test all applications on a 5.012 server prior to the upgrade. Also, you say single sign-on, but I am not sure if you are meaning Web SSO or client/OS sign-on.

If it is Web SSO, that is easily done by creating a LPTA token and putting the necessary servers in that Web SSO document. You then set the servers to use multi-server authentication in the server document HTTP sections, and you will be fine. If you are talking OS/client single sign on, that will take more effort. The standard way of implementing this is to make it part of the client install or run a secondary install for the service if you didn't install it initially. You could figure out which files and registry keys are needed and then get those onto the workstations as well. However, there is some work to do on each machine if this is your intention.

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