[FML]: Attempting connection with missing mods [ForgeEssentials] at CLIENT
when connect to
"forgeessentials-1.8.9-1.8.5.103-server.jar"
using "forgeessentials-1.8.9-1.8.5.103-client.jar"
as client has no effect too.
all are disabled in main.cfg, only B:AuthLogin=true
server:
forge-1.8.9-11.15.1.1902-1.8.9-universal.jar
minecraft_server.1.8.9.jar
client same version.

problem solved.
problem was ... different IC2.ini at client and server O_O
looks like ic2 for 1.8.9 do not want download server's config like for 1.7.10