Ensure server is not exposed to more than 32 private hosts for Azure Network Security Rule

Too many IP addresses may lead to unnoticed un-authorized access.

Configure Network Security Rule to ensure the ports are not exposed more than 32 private hosts. In console -

1. In settings of NSG select Inbound security rules.
2. Use Add button here to add security rules.
3. Create security rules for any application, port range, ip range.
   In terraform -
   Set the value of 'access' to [allow | deny]. Set the value of 'direction' to 'inbound'. Set the value of 'source_address_prefix' to an IP address or a range of IP addresses. These network security rules in controlling inbound connections to your resources in Azure.