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I have a wcf application hosted in a windows service running a local windows account. Do I need to set an SPN for this account? If so, what’s the protocol the SPN needs to be set under? I know how to do this for services over HTTP, but have never done it for net.tcp.
By default (i.e. out of the box) net.tcp services are unsecured and don’t perform any authentication at all. So you won’t need (and in fact can’t) set a service principal name.
If you need to authenticate, then check the net.tcp security modes on MSDN. The best way to understand the different combinations is to experiment!