May be related to PR 192661. Installing net/freeradius3 as a package on 10.1-RELEASE results in the following output when started in debug mode: root:~ # radiusd -X libssl version mismatch. built: 1000105f linked: 100010af libssl version mismatch. built: 1000105f linked: 100010af libssl version mismatch. built: 1000105f linked: 100010af libssl version mismatch. built: 1000105f linked: 100010af libssl version mismatch. built: 1000105f linked: 100010af The mismatch line will keep repeating until the process is killed. The daemon does not seem to accept any connections.
Fixed in recent update to the port.