vim --servername doesn't work

i'm trying to use the asynccommand plugin,
it requires that vim be started as a server
so im starting vim as follows:

vim --servername vim

yet asyncommand still complains that vim
is not in servermode. and also v:servername
has nothing in it. what am i missing ?
btw my version vim has +clientserver enabled.

Normal version with GTK2 GUI. Features included (+) or not (-):
-arabic +autocmd +balloon_eval +browse +builtin_terms +byte_offset +cindent +clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments -conceal +cryptv +cscope +cursorbind +cursorshape
+dialog_con_gui +diff +digraphs +dnd -ebcdic -emacs_tags +eval +ex_extra +extra_search -farsi +file_in_path +find_in_path +float +folding -footer +fork() +gettext -hangul_input +iconv +insert_expand
+jumplist -keymap -langmap +libcall +linebreak +lispindent +listcmds +localmap -lua +menu +mksession +modify_fname +mouse +mouseshape -mouse_dec +mouse_gpm -mouse_jsbterm -mouse_netterm -mouse_sysmouse
+mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg -osfiletype +path_extra -perl +persistent_undo +postscript +printer -profile -python -python3 +quickfix +reltime -rightleft -ruby +scrollbind
+signs +smartindent -sniff +startuptime +statusline -sun_workshop +syntax +tag_binary +tag_old_static -tag_any_white -tcl +terminfo +termresponse +textobjects +title +toolbar +user_commands +vertsplit
+virtualedit +visual +visualextra +viminfo +vreplace +wildignore +wildmenu +windows +writebackup +X11 -xfontset +xim +xsmp_interact +xterm_clipboard -xterm_save
system vimrc file: "$VIM/vimrc"

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