セキュリティレベルを変更しようとすると

[root@localhost ~]# system-config-securitylevel
Traceback (most recent call last):
File I/usr/share/system-config-securitylevel/system-config-securitylevel.pyI, line 18, in ?
app.stand_alone()
File I/usr/share/system-config-securitylevel/securitylevel.pyI, line 453, in stand_alone
self.readFile()
File I/usr/share/system-config-securitylevel/securitylevel.pyI, line 353, in readFile
protoname = socket.getservbyport(int(service), protocol)
socket.error: port/proto not found
となります
一体なんなんでしょうか?