Here's some info and the port list required:
https://stackoverflow.com/questions/17472291/jenkins-slave-port-number-for-firewall
JNLP port 49187 worked ("Configure Global Security" -> "TCP port for JNLP
slave agents").
TCP
49187 - Fixed jnlp port
8080 - jenkins http port
Other ports needed to launch slave as a windows service
TCP
135
139
445
UDP
137
138
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