Bernard,
Welcome to the Community. Looks like you joined 30 minutes before posting this topic. What error were you seeing during that time that prevented you from posting logs?
A 401 error suggests that you were having issues authenticating.
Were you getting this error when attempting to navigate your browser to the application, or when using maven to pull or push components?
The following pages all address installation of Nexus Repository Manager in formats which appeal to different learners:
-
Technical documentation
Installation: Installation
Maven configuration: Maven Repositories - Written guide Nexus Repository Manager - Proxying Maven and npm Quick Start - Sonatype Guides
- Self-guided course First Time Installation and Setup | Learn Sonatype
There is also an older blog post which specifically addresses how to diagnose 401 errors: