netstat -l -t tcp output during problem:
tcp 0 0 *:12500 *:* LISTEN - tcp6 0 0 [::]:12500 [::]:* LISTEN -
netstat -l -t tcp output during problem:
tcp 0 0 *:12500 *:* LISTEN -
tcp6 0 0 [::]:12500 [::]:* LISTEN -