I wish to use jetpack in my WordPress account

[KangJL]

@Saif012

Could hosting block the xmlrpc.php file due to security reasons

That is indeed the reason.

@Saif012

I required you to give access in xmlrpc.php file.

Not likely to happen. Upgrade to premium hosting if you need that functionality

@Ensuring only web browsers can access your website

Can I disable this security system?

No, this security system is mandatory on all websites and cannot be disabled.

If this security system means your website or application does not work as expected on InfinityFree, please consider to moving your website to premium hosting. On premium hosting, this security system is not present (your website will be protected in less obtrusive ways), so you can access your website through other clients which are not browsers (like mobile apps, automated verification tools, etc.).