Thanks root,
This error was caused by the log line: May 27 12:51:51 tty0 kernel: [1896557.253647] audit: type=1400 audit(1464317511.752:362): apparmor="ALLOWED" operation="file_perm" profile="/usr/sbin/nginx" pid=13215 comm="nginx" laddr=45.32.188.150 lport=443 faddr=101.174.56.194 fport=62972 family="inet" sock_type="stream" protocol=6 requested_mask="receive" denied_mask="receive"
Thanks root,
This error was caused by the log line: 1.752:362) : apparmor="ALLOWED" operation= "file_perm" profile= "/usr/sbin/ nginx" pid=13215 comm="nginx" laddr=45.32.188.150 lport=443 faddr=101. 174.56. 194 fport=62972 family="inet" sock_type="stream" protocol=6 requested_ mask="receive" denied_ mask="receive"
May 27 12:51:51 tty0 kernel: [1896557.253647] audit: type=1400 audit(146431751