THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Check out the archiva.xml file in your $M2_HOME/ directory (usually ~/.m2/) and you'll understand how.
How do I let users access my repository without logging in?
Edit the 'guest' user and grant it the repository observer role for that repo. There is also a global repository observer role you can grant, if you want all of your repositories to be visible without logging in.