Impossible de me connecter à mon serveur Rust

Bonjour je viens de créer un serveur rust qui est sous Ubuntu Server 16.04, je l'ai installer grâce à ce tuto:
http://oxidemod.org/threads/setting-up-a-rust-server-with-linux-and-lgsm.16528/

j'ai donc presque tout fait je me suis arretter à "./rustserver start" le serveur se lance tout me mais OK et après j'ouvre les ports sur ma box (28015 et 28016) donc je me connecte dessus avec mon adresse IP externe et boom ça ne fonctionne pas, le serveur et chez moi je ne suis pas chez moi pour l'instant donc j'uttilise l'adresse IP externe voici le fichier rustserver que j'ai modifier

Merci d'avance :D

#!/bin/bash
# Rust
# Server Management Script
# Author: Daniel Gibbs
# Contributor: UltimateByte (LGSM adaptation), Wulf (Information)
# Website: gameservermanagers.com
if [ -f ".dev-debug" ]; then
exec 5>dev-debug.log
BASH_XTRACEFD="5"
set -x
fi

version="210516"

#### Variables ####

# Notification Alerts
# (on|off)

# Email
emailalert="off"<29>email="email@example.com"

# Pushbullet
# www.pushbullet.com/#settings
pushbulletalert="off"
pushbullettoken="accesstoken"

# Steam login (not required)
steamuser="anonymous"
steampass=""

# Server settings
# More settings available after install in serverfiles/server/rust-server/server.cfg
servername="Rust"
ip="78.215.25.234"
updateonstart="off"
port="28015"
rconport="28016"
rconpassword="conectionwifi"
maxplayers="50"

# Advanced
seed="128" # default random; range : -2147483647 to 2147483647 ; used to change or reproduce a procedural map
worldsize="4000" # default 4000; range : 2000 to 8000 ; map size in meters
saveinterval="300" # Auto-save in seconds
tickrate="30" # default 30; range : 15 to 100

# developer.valvesoftware.com/wiki/Rust_Dedicated_Server
fn_parms(){
parms="-batchmode +server.ip ${ip} +server.port ${port} +server.tickrate ${tickrate} +server.hostname \"${servername}\" +server.identity \"${servicename}\" ${conditionalseed} +server.maxplayers ${maxplayers} +server.worldsize ${worldsize} +server.saveinterval ${saveinterval} +rcon.ip ${ip} +rcon.port ${rconport} +rcon.password \"${rconpassword}\" -logfile ${gamelogfile}"
}

# Specific to Rust
if [ -n "${seed}" ]; then
# If set, then add to start parms
conditionalseed="+server.seed ${seed}"
else
# Keep randomness of the number if not set
conditionalseed=""
fi

#### Advanced Variables ####

# Github Branch Select
# Allows for the use of different function files
# from a different repo and/or branch.
githubuser="dgibbs64"
githubrepo="linuxgsm"
githubbranch="master"

# Steam
appid="258550"

# Server Details
servicename="rust-server"
gamename="Rust"
engine="unity3d"

# Directories
rootdir="$(dirname $(readlink -f "${BASH_SOURCE[0]}"))"
selfname=$(basename $(readlink -f "${BASH_SOURCE[0]}"))
lockselfname=".${servicename}.lock"
lgsmdir="${rootdir}/lgsm"
functionsdir="${lgsmdir}/functions"
filesdir="${rootdir}/serverfiles"
systemdir="${filesdir}"
executabledir="${filesdir}"
executable="./RustDedicated"
serveridentitydir="${systemdir}/server/${servicename}"
servercfg="server.cfg"
servercfgdir="${serveridentitydir}/cfg"
servercfgfullpath="${servercfgdir}/${servercfg}"
servercfgdefault="${servercfgdir}/lgsm-default.cfg"
backupdir="${rootdir}/backups"

# Logging
logdays="7"
gamelogdir="${rootdir}/log/server"
scriptlogdir="${rootdir}/log/script"
consolelogdir="${rootdir}/log/console"
consolelogging="on"

gamelog="${gamelogdir}/${servicename}-game.log"
scriptlog="${scriptlogdir}/${servicename}-script.log"
consolelog="${consolelogdir}/${servicename}-console.log"
emaillog="${scriptlogdir}/${servicename}-email.log"
gamelogfile="\"gamelog-$(date '+%Y-%m-%d-%H-%M-%S').log\""

scriptlogdate="${scriptlogdir}/${servicename}-script-$(date '+%d-%m-%Y-%H-%M-%S').log"
consolelogdate="${consolelogdir}/${servicename}-console-$(date '+%d-%m-%Y-%H-%M-%S').log"

##### Script #####
# Do not edit

# Fetches core_dl for file downloads
fn_fetch_core_dl(){
github_file_url_dir="lgsm/functions"
github_file_url_name="${functionfile}"
filedir="${functionsdir}"
filename="${github_file_url_name}"
githuburl="raw.githubusercontent.com/${githubuser}/${githubrepo}/${githubbranch}/${github_file_url_dir}/${github_file_url_name}"
# If the file is missing, then download
if [ ! -f "${filedir}/${filename}" ]; then
if [ ! -d "${filedir}" ]; then
mkdir -p "${filedir}"
fi
echo -e " fetching ${filename}...\c"
# Check curl exists and use available path
curlpaths="$(command -v curl 2>/dev/null) $(which curl >/dev/null 2>&1) /usr/bin/curl /bin/curl /usr/sbin/curl /sbin/curl)"
for curlcmd in ${curlpaths}
do
if [ -x "${curlcmd}" ]; then
break
fi
done
# If curl exists download file
if [ "$(basename ${curlcmd})" == "curl" ]; then
curlfetch=$(${curlcmd} -s --fail -o "${filedir}/${filename}" "${githuburl}" 2>&1)
if [ $? -ne 0 ]; then
echo -e "\e[0;31mFAIL\e[0m\n"
echo "${curlfetch}"
echo -e "${githuburl}\n"
exit 1
else
echo -e "\e[0;32mOK\e[0m"
fi
else
echo -e "\e[0;31mFAIL\e[0m\n"
echo "Curl is not installed!"
echo -e ""
exit 1
fi
chmod +x "${filedir}/${filename}"
fi
source "${filedir}/${filename}"
}

core_dl.sh(){
# Functions are defined in core_functions.sh.
functionfile="${FUNCNAME}"
fn_fetch_core_dl
}

core_functions.sh(){
# Functions are defined in core_functions.sh.
functionfile="${FUNCNAME}"
fn_fetch_core_dl
}

core_dl.sh
core_functions.sh

getopt=$1
core_getopt.sh

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