ss is missing listeners (ipv6?)

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I have a server running Apache on port 80. netstat shows it running:

# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address
     State       PID/Program name
tcp        0      0 0.0.0.0:43257               0.0.0.0:*
     LISTEN      2760/ClusterDaemon
tcp        0      0 0.0.0.0:6556                0.0.0.0:*
     LISTEN      2635/xinetd
tcp        0      0 0.0.0.0:6557                0.0.0.0:*
     LISTEN      2635/xinetd
tcp        0      0 :::80                       :::*
     LISTEN      10785/httpd
tcp        0      0 :::22                       :::*
     LISTEN      2600/sshd

ss -lnt does not. Notice that the sshd port is also missing.

# ss -lnt
Recv-Q Send-Q             Local Address:Port               Peer Address:Port
0      0                              *:43257                         *:*
0      0                              *:6556                          *:*
0      0                              *:6557                          *:*

It really is running; I can access port 80. Why doesn't ss show it? I
played with other options, but couldn't find anything that worked.

# ss -6ln
Recv-Q Send-Q             Local Address:Port               Peer Address:Port
# ss -6lnt
ss: no socket tables to show with such filter.
# ss -a6n
State      Recv-Q Send-Q        Local Address:Port          Peer Address:Port
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