Error 417 on restricted network

[ToxaKniotee 0]

Hi, I'm interested on use a vpn to get access to restricted sites on a local network with a moderate high speed bandwidth, I've been using a different vpn to fulfill this, but recently only use linux so I need an alternative to my previous vpn, I tried to connect with the client inside the network but got error 417, on an unrestricted network didn't get the error, instead got the message 'Subscription required'.

 

I searched the 417 error on internet but didn't understood the answers so I'm asking here how can I solve this problem?, also is there any trial service to test the service to allow me connect and download on a restricted network before any purchase?.