Server bug (ACR 2.5.7)

[asmanel]

D:\logiciels\portables\jeux\act_02_05_07-w>bin_win32\ac_server.exe -Cconfig/serv
ercmdline.txt
reading commandline parameters from file 'config\servercmdline.txt'
logging started: console(INFO), file(INFO, "serverlog_20130410_21.33.09_local#28
770.part1.txt"), syslog(DISABLED), timestamp(DISABLED)
logging local AssaultCube server (version 20507, protocol 134/100) now..
detected 23 official maps
read 39 map rotation entries from 'config\maprot.cfg'
read 0 admin passwords from 'config\serverpwd.cfg'
read 0 (0) blacklist entries from 'config\serverblacklist.cfg', 0 errors
read 0 + 0 entries from nickname blacklist file 'config\nicknameblacklist.cfg',
0 errors
read 19 forbidden entries from 'config\forbidden.cfg'
read 196 bot names from 'config\botnames.cfg'
dedicated server started, waiting for clients...
Ctrl-C to exit
sending registration request to master server
looking up ms.acr.victorz.ca...
[23.20.252.137] resolved ms.acr.victorz.ca
masterserver reply: ERROR: unreachable (UDP 28770/28771) 2/2 warnings exceeded -
server not renewed

I tried to run a server, following the Server Tutorial, and I the console window returned this.

I searched what is wrong but I didn't find.