help me.

[robertolabarca]

===============================================================================================
config.yaml

===============================================================================================

storage: ./storage

auth:
  htpasswd:
    file: ./htpasswd
  
uplinks:
  npmjs:
    url: https://nexus-3/repository/npm-mirror

packages:
  '@*/*':
  
    access: $all
    publish: $all

  '*':
      access: $all
      publish: $all

      proxy: npmjs


logs:
  - {type: stdout, format: pretty, level: http}

================================================================================
npm config

cache-min = 99999999
registry = "http://127.0.0.1:4873/"
strict-ssl = false

==============================================================================
NOW

mkdir temp
cd tmp
npm init
npm install jquery -g

THEN
D:\npm\npmlazy>sinopia
warn --- config file - C:\Users\roberto\AppData\Roaming\sinopia\config.yaml
warn --- http address - http://localhost:4873/
http --> ERR, req: 'GET https://nexus-3/repository/npm-mirror/jquery', error: self signed certificate
http <-- 404, user: undefined, req: 'GET /jquery', error: no such package available

[lengziyu]

I see your user: undefined,You can try :

$ npm set registry http://127.0.0.1:4873
$ npm adduser --registry http://127.0.0.1:4873