How to hide the Apache version and OS information to security scan?

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In Ubuntu edit the following file
sudo vim /etc/apache2/conf-enabled/security.conf

Change ServerTokens OS to ServerTokens Prod 

then change ServerSignature On to ServerSignature Off

Restart the apache2 :

sudo service apache2 restart


In CentOS and RedHat edit the following file:

 vim /etc/httpd/conf/httpd.conf

Change ServerTokens OS to ServerTokens ProductOnly 

then change ServerSignature On to ServerSignature Off

Restart the apache2 

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