mjhjmtu

The service works perfectely if I am not logged in, but if I connect with ssh and then disconnect the service gets terminated. The service belongs to the user to whom I ssh. This is my current ts3.service file:

[Unit]
Description=TeamSpeak3Server

[Service]
User=user1
Group=staff
Type=forking
WorkingDirectory=/usr/local/bin/teamspeak3-server_linux_amd64
ExecStart=/usr/local/bin/teamspeak3-server_linux_amd64/ts3server_startscript.sh start
ExecStop=/usr/local/bin/teamspeak3-server_linux_amd64/ts3server_startscript.sh stop
PIDFile=/usr/local/bin/teamspeak3-server_linux_amd64/ts3server.pid
RestartSec=5
Restart=always
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

I have already tried changeing ExecStart to

ExecStart=/usr/bin/nohup /usr/local/bin/teamspeak3-server_linux_amd64/ts3server_startscript.sh start

Other services like openvpn survive the ssh logout.
After reconnection the status of the systemd process reads:

active (exited)

while the normal status is

active (running)

Could the cause of the problem be that the script which I execute calls another script which gets killed if the shell sends sighup meassages?
Thank you for your answers.

Edit:

the important part of ts3server_startscript.sh are as follows:

COMMANDLINE_PARAMETERS="$2"
D1=$(readlink -f "$0")
BINARYPATH="$(dirname "$D1")"
cd "$BINARYPATH"
LIBRARYPATH="$(pwd)"
BINARYNAME="ts3server"

if [ -e "$BINARYNAME" ]; then
 if[ -x "$BINARYNAME" ]; then
 export LD_LIBRARY_PATH="$LIBRARYPATH:$LD_LIBARY_PATH"
 "./$BINARYNAME" $COMMANDLINE_PARAMETERS > /dev/null &
 PID=$!
 ps -p $PID > /dev/null 2>&1
 if [ "$?" -ne "0" ]; then
 echo "..."
 else
 echo $PID > ts3server.pid
 fi

So if I interpret that correctely the server is started in the console by

 "./$BINARYNAME" $COMMANDLINE_PARAMETERS > /dev/null &