Not so difficult to close.
Shut off all systems that provide remote access.
The company I work for has recently cut back on the number of users with Smartphone access to corporate email after a PCI audit called the percentage of remote users "dangerously high" causing "unnecessary vulnerabilities."
It is common that a companys public statements do not reveal the real reason why changes are being made.
In our case it was a PCI audit that drove the decision. Publicly it was pitched as an effort to reduce the number of people doing 'after hours' work.
The old ' the company feels when you are home you should focus on family time' line. It makes the company look like it cares about it's employees.
