failed to perform an HTTPS request: Post https://1.1.1.1/dns-query: EOF

[yon2004]

I am attempting to get cloudflared proxy-dns to work reliably but i have come across this error

time="2018-04-16T10:44:12Z" level=error msg="failed to connect to an HTTPS backend \"https://1.1.1.1/dns-query\"" error="failed to perform an HTTPS request: Post https://1.1.1.1/dns-query: EOF"
time="2018-04-16T10:44:13Z" level=error msg="failed to connect to an HTTPS backend \"https://1.1.1.1/dns-query\"" error="failed to perform an HTTPS request: Post https://1.1.1.1/dns-query: dial tcp 1.1.1.1:443: socket: too many open files"

Looking at netstat there is a large number of sockets stuck in the CLOSE_WAIT state.

tcp      386      0 124.188.xxx.xxx:56366    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56450    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56389    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56386    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56463    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56254    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56504    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56454    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56262    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56532    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56487    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56380    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56286    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56490    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56475    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56385    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56312    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56282    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56387    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56535    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56379    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56401    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56492    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56528    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56285    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56373    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56518    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56257    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56349    1.1.1.1:443             CLOSE_WAIT
tcp      385      0 124.188.xxx.xxx:56345    1.1.1.1:443             CLOSE_WAIT
tcp      387      0 124.188.xxx.xxx:56477    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56321    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56397    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56534    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56468    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56340    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56457    1.1.1.1:443             CLOSE_WAIT
tcp      386      0 124.188.xxx.xxx:56363    1.1.1.1:443             CLOSE_WAIT

I am running this on a ubiquity edge router Lite and after looking at the ulimit is set below.

root@ubnt:~# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 1934
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1934
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

cloudflared.log