Are VPNs Blocked?

Are vpn services blocked? I currently have to use a vpn to get around some bad routing by the backbone provider my isp is using (it is trying to connect me to Chicago from Colorado via Texas) but for some reason I can’t connect to or use the app when the vpn is running. All other sites seem to work just fine so I know the vpn is working correctly.

Edit: You can ignore this now. It was a problem with vpns dns server.