SECURITY SET DCC INITIATE

Usage: DCC SET INITIATE <chat|file|unknown> <enable|disable>

This command allows you to block DCC (Direct Client to Client) session initiation; this has the effect of preventing the use of DCC over your server. You can selectively allow or disallow file transfers (dcc initiate file <enable|disable>), private chat sessions (dcc initiate chat ) or any other client-specific, but unknown types.

Example:
/as security dcc set override enable

You would normally use this command if you wanted to disallow the use of DCC on your network, either to limit file transfers, or to limit private chat sessions.