port 9987 not working

lundi 31 août 2015

i have a teamspeak3 server working for a while 85 days
and all ports works fine
suddenly port 9987 not working
and another ports working fine !
i reinstall the os
ubuntu and centos and fedora same problem
and setup all teamspeak3 version same problem
and i talking to my vps support he told me the ports works fine
this problem from teamspeak3 !

Help me fast please