People can block their anti virus, download the client and play.
It's a test server, you don't need to advertise it, you don't need to have a release date, just open it and if people are still being bitchy and won't trust your client, they can wait 1-2 days later after you fix it.
It makes perfect sense if this issue occurred before the real server, but a test server(which is a war server with unlimited supplies and default level)? I don't think it matters that much. You said you were gonna open the server for a couple weeks also.