SPNs - Who? Why? Where?

I was making an introduction to a new teammate about SharePoint infrastructure, and one of the things I had to teach her about was SPNs. I was surprised to know almost no one at our place knew what SPNs are actually for. Until my PowerPoint presentation is ready, here is …

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2008 Clusters can't change password

Last week MS's PFE Moti Bani and me solved a problem that bugged me for ~ a year - since the day we've started deploying 2008 clusters in our production environment:
2008+ Clusters can't update their CNO and VCO accounts' passwords.
The error, as shown in the cluster administrator, was:

Cluster network …
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