delete thease lines from your hosts file:
xxx.xxx.xxx.xxx nProtect.lineage2.com
xxx.xxx.xxx.xxx l2authd.lineage2.com
xxx.xxx.xxx.xxx l2testauthd.lineage2.com
where xxx.xxx.xxx.xxx = the ip of a private server.
also if the private server has custom system do a full update with lineage2.exe