If you don't already have filters (which is really stupid, but hey..):
add pmfilter pmtelnet
set filter 1 permit your-trusted-host/32 your-pm-host/32 tcp dst port eq your-telnet-port
set pmfilter 2 deny 0.0.0.0/0 your-pm-host/32 tcp
set all ifilter pmfilter
set all ofilter pmfilter
Or something like that.
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