limit in user

[ven3xn0]

hello my problem is

root@vps6608 Unreal3.2]# ulimit -n
12000

clients
{
pingfreq 90;
maxclients 12000;
sendq 100000;
recvq 4000;

How many file descriptors (or sockets) can the IRCd use?
[12000] ->


is the numers in my conf and the irc only enter 347 users why?

[Syzop]

Well, when the 348th user tries to enter, what error does this user receive?
And what error message do the ircops see?

[ven3xn0]

nothing only not enter