sudo changeip old_ip new_ip old_hostname new_hostname what somewhat
But still the link to Podcast URL still does not work.
Google Search ‘change “Podcast Library URL”‘ give some insight available at Apple Discussion Forum
The key message copied here:
There should be entries for server_host, tunnel_agent_host & tunnel_server_host that will need to be updated while PCP2 is shut down, which should handle it.