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From setting of network interface
# Control-alias eth0
Iface eth0 inet static
Address 10.15.0.6
Netmask 255.255.0.0
Please try comment out the local IP address setting like.
In the case of Ubuntu 16.04, this solves the problem. The problem is that the listening IP address was an IP address for DigitalOcean Floating IP.
Machine translation may make reading difficult. Excuse me.