This procedure is the only one which worked for me on a Windows 2012 R2 RDP session:
Click Start.
Type osk (to bring up the on screen keyboard)
Hit enter.
Once the on screen keyboard is open, hold ctrl+Alt on your physical keyboard, then click on the del key in the on screen keyboard.
Minimize the on screen Keyboard.
tuning apache
https://rmohan.com/?p=1150
The changes will require the following changes in the HTTP.cong (/etc/httpd/conf/httpd.conf)
—-
KeepAlive on
MaxKeepAliveRequests 100
KeepAliveTimeout 2
<IfModule prefork.c>
StartServers 10
MinSpareServers 10
MaxSpareServers 20
ServerLimit 1000
MaxClients 1000
MaxRequestsPerChild 4000
</IfModule>
<IfModule worker.c>
StartServers 10
MaxClients 1000
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 1000
</IfModule>
—