Sorry, we don't provide any support for questions of getting XAMPP accessible from potential insecure networks. XAMPP is a preconfigured local test and development webserver stack and not a one click online webserver stack.
There are other webserver stacks like Zend Server which are designed for production and live server purposes.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~free software according to purpose of usageXAMPP 1.8
for local development/testing onlyZend Server 6 (free)
for production environments
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~It's like porn for programmers