In ncurses custom color is not working with libc and remote terminal

In ncurses custom color is not working with libc and remote terminal

I am currently working on ncurses with LIBC , *i need a custom color , the
color is DARK_GREEN i have used int init_color() but it is not working*
The can_change_color(void); returns false ,
NB: i am working on remote terminal with XSHELL , the XSHELL can show text
in console with any custom color , i have option in xshell to change
console color to any custom RGB value , But with NCURSES i am not able to
get a custom color.