Proxy behaviour issue migrating from 1.3.x to 2.x

Two users (Olivier Erhart [1], Tzur Turkenitz [2]) has trouble with proxy settings trying to configure archiva 2.1.1 and had to downgrade to archiva 1.3x

The steps to reproduce:
1) Install or upgrade archiva to 2.1.1
2) Set up a proxy
3) Set the proxy to a proxy connector

I'm following these simple steps:
1) Network Proxies - Adding a new network proxy; protocol: http, host: example.proxy.com, port: 8080

2) Proxy Connectors - Add the network proxy between the Managed and Remote repositories
i. For some reason, when clicking on the question mark icon in the 'Proxy Connector Settings' column shows 'Network Proxy: None', even though it is set correctly and when checking the archiva.xml file under /conf it is listed there properly.

3) Repositories – > Remote Repositories Management, on remote check there's an icon that circles and does not resolve into a check mark.

[1] https://www.mail-archive.com/users@archiva.apache.org/msg02757.html
[2] https://www.mail-archive.com/users@archiva.apache.org/msg02676.html