Xvfb: export display permanently

I have recently set up Xvfb on Centos 7 machine. It is working absolutely fine. Only problem is that if I quit putty session (remote access) it would keep running Xvfb in background but display will be gone. So next time when I take remote access via putty first I have to type export DISPLAY=:99 again, then I start my tests. How can I make it permanent? I don't see solution to my problem in this thread https://unix.stackexchange.com/questions/14594/how-to-make-exported-shell-variables-permanent **Update:** .profile contents: export M3_HOME=/home/aditi.a/apache-maven-3.5.4/bin export PATH=$PATH:$M3_HOME export JMETER_HOME=/home/aditi.a/apache-jmeter-5.0/bin export PATH=$PATH:$JMETER_HOME export JAVA_HOME=/usr/java/jdk1.8.0_192-amd64 export PATH=$PATH:$HOME/bin:$JAVA_HOME/bin export DISPLAY=:99 **echo variables output:** $ echo $JAVA_HOME /usr/java/jdk1.8.0_192-amd64 $ echo $M3_HOME /home/adit.a/apache-maven-3.5.4/bin $ echo $DISPLAY $ *which shell I am running* $ ps -p $$ PID TTY TIME CMD 30678 pts/14 00:00:00 sh