I had some issues with Untangle and was going to move away from it, so I cancelled the Paypal billing agreement.
Long story short.. I ended up doing about my 4th reinstall of Untangle and all seems ok now.
However, I asked in support ticket about the Paypal billing agreement and didn't really get a proper answer.
So.. how can I reinstate Paypal? If I use a credit or debit card, then my bank charges me a foreign currency fee.
I presume it needs some manual intervention your end, because I cannot pay the invoice by Paypal at the moment.