Hello Thiru,
You can add the maxRequestWorkers within the Custom Basic section of the httpd.tpl file. This file is used as an information source and is used to recreate the httpd.conf file.
Per past cases reporting that message you can try a value of 1024 but you should keep an eye on the system to check if the hardware is able to handle it without performance issues.
Here is a KB article with more info on making changes like this:
Customizations to httpd.conf file are removed after configuration changes (Legacy KB ID CNC TS34911 )
As the KB references all the new lines or modified values should be placed between the “# Custom Protect Section" lines of the httpd.tpl file:
....
# Custom Protect Section
<<place the values here>>
# End Custom Protect Section
....
So make those changes, then recreate the httpd.conf file and signal the web server to reread the new httpd.conf either by adding or modify the permissions of a web user from the web UI or using the nhHttpdCfg command.
Let us know if that helps answer this question.
Thanks,
Michael