That's right, http://vps90685.ovh.net:8080/ is setup to reject all addresses which are not mainnet addresses.
Here is a new instance of the demo app for testnet addresses: http://vps90685.ovh.net:8084/
I just tried the TestNet version and I can confirm that it works like it should. Thanks for keeping those servers up and running. Here is a new instance of the demo app for testnet addresses: http://vps90685.ovh.net:8084/
