usermin 20000 work but virtualmin 10000 not working

i have ubuntu 16.04 x64 vps.
i could login to virtualmin weel but yesterday it goes down and it shows time out on 10000 port.
i restart webmin : /etc/webmis/restart and its status is ok.
/var/webmin/miniserv.error file has no error and
ps auw | grep miniserv returns
root 14776 0.0 0.0 12948 968 pts/0 S+ 11:18 0:00 grep --color=auto miniserv

i was 1 time nano /etc/shadow and save that , i dont know what is going on.

please help me to access virtualmin

i cant the solution but i change the port to 10100 it works fine