Server trouble

null@example.com (UnoSkorpion) — Tue, 01 Oct 2013 14:02:58 +0000

Hello there.
I got this when i was starting my server:

[524af770][register]: ERROR: the master server reports that clients can not connect to this server.
[524af770][register]: ERROR: configure your firewall/nat to let through udp on port 2801.

But I start tw servers on my comercial machine, and system admins said that all ports are opened.
Very interesting...
I checked my listened ports by command:

netstat -tulpan

and got

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      5367/sshd
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1371/master
tcp        0      0 213.85.31.83:22             46.160.34.219:51576         ESTABLISHED 18772/sshd
tcp        0      0 213.85.31.83:22             46.160.34.219:51525         ESTABLISHED 18744/sshd
tcp        0     52 213.85.31.83:22             46.160.34.219:51622         ESTABLISHED 18944/sshd
tcp        0      0 :::22                       :::*                        LISTEN      5367/sshd
tcp        0      0 ::1:25                      :::*                        LISTEN      1371/master
udp        0      0 0.0.0.0:2801                0.0.0.0:*                               19027/./01inot
udp        0      0 :::2801                     :::*                                    19027/./01inot

I think my machine don't give address for my server, cuz i have it with starting MC server, but i wonder.
I have Linux CentOS x64.

I found a interesting thing, when i cheking my port with nmap i got that it's close. When i cheking my port after server starting i got that it's open.
i tried it with my machine, and when i cheking ports with nmap after server starting i got that it's lock.

---------------------------------------------------
Oh my God, i found reason of this peace of ...
Firewall (IPTables) of CentOS was working, i shuted it, and servers work

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Server trouble