It does work, just not against the localhost. Eg:
>From a remote host:
$ rpcinfo -p 192.168.122.156
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
Then on 192.168.122.156 add to /etc/hosts.deny:
portmap: ALL
Then from a remote host:
$ rpcinfo -p sec-jaunty-i386.
No remote programs registered.
** Visibility changed to: Public
** This bug is no longer flagged as a security vulnerability
** Changed in: portmap (Ubuntu)
Status: New => Invalid
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[jaunty] portmap does not read hosts.deny
https://bugs.launchpad.net/bugs/398643
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