pptp VPN has stopped working overnight

[#1]

Hi
I have successfully been using a pptp vpn with my plusnet.  Overnight both machines have stopped connecting.
A friend who uses the same service and is on plusnet has also experienced the same thing. 
Has plusnet implemented any changes this week or updated any settings/firmware to the router?
Thanks

[#2]

Hi there,
Sorry to hear about this.
We haven't made any changes to your service in a way that could have caused this (or otherwise).
Are you both able to trace to the IP of the machine which you're attempting to connect to?