So you will have to check if the Moodle installation is made under the Apache or the IIS "file system". By the way, if you are running two different web servers they are running on two different port numbers ? (And the webserver you can reach like this would be the web server visible for most people: http://< server ip> :80 (That one running at port 80 as port 80 is the default port number for a web server.)
Hardware and performance
Stop and start moodle from remote machine
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