SPN problems?

Hello,

There is a web application that uses .NET (IIS) and Java (Tomcat) application servers (some users prefer one variant to another).

The problem is when configuring Single Sign-On for this application with Active Directory as authentication service. Both variants use some Service Principal Names to set-up SSO, and eventually there is some sort of conflict between them. Each variant can be configured separately with no problem, but when I try to make them work together they both fail.

IIS and Tomcat run on the same machine.

My first thought is: should I pay special attention when setting SPNs with such configuration, ie. two web services running on the same machine, IIS on port 80, Tomcat on port 8080? I realize what I write is a bit vague, but I am starting to deal with the problem. Maybe someone have dealt with similar problem?

Any thoughts would be greatly appreciated.

thank you,
gonzo
.

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