My /Library/Preferences/Parallels/network.desktop.xml contained setting from an older installation but this seems not to work even if I see an open port 10001 after starting the vm (netstat -an | grep 10001).
Code:
<NATServer dyn_lists="">
<Enabled>1</Enabled>
<PortForwarding dyn_lists="">
<TCP dyn_lists="ForwardEntry 2">
<ForwardEntry id="1" dyn_lists="">
<RuleName>fw rule 0</RuleName>
<IncomingPort>10001</IncomingPort>
<RedirectIp></RedirectIp>
<RedirectPort>10001</RedirectPort>
<RedirectVm>{343a5954-f02d-4325-b657-d25a4493a107}</RedirectVm>
</ForwardEntry>
</TCP>
<UDP dyn_lists="ForwardEntry 0"/>
</PortForwarding>
<IdleConnectionTimeoutSecs>7440</IdleConnectionTimeoutSecs>
<UseIPFilter>0</UseIPFilter>
</NATServer>