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This may be due to the fact that plugin also allocate ports from ephemeral port range.
Steps to reproduce:
1. Create Jenkins jobs with some ports assigned randomly by this plugin
2. Run the jobs multiple times and note ports that were assigned
3. Execute 'cat /proc/sys/net/ipv4/ip_local_port_range' which will display ephemeral port range on a machine
4. Some of the ports fall into ephemeral port range which on machines with a lot of network traffic (a lot of it-tests, e2e-tests, connection tests etc.) will increase probability of port conflict (choosing port that will be assigned to another process by the OS in a moment).