I have a FS server running on one server and on a remote server I have a Node JS instance controlling it using node_esl (a Node JS Event Socket library for FS).
Every time I'm sending a request to the server I have the following error:
[WARNING] mod_event_socket.c:2603 IP ::ffff:192.168.59.3 Rejected by acl "loopback.auto"
I found out why: ACL was not really that well configured. The one used was not opening the right connection for event_socket. So either Event_Socket was opened for local use only or for external use only. Had to recreate a new ACL with local access opened (necessary if you want to use fs_cli) and adding the IPs of the controlling servers.
Thx for your suggestion regarding IPv6, I tested it earlier and found out it has no effect on my "issue"