Minecraft Forums

Hey y'all, I recently was put behind an external firewall, with all ports needed to run minecraft open. I am trying to connect to a server, I can ping/see it in the server browser, but only get that response after the logging in screen. The server uses the default port, and I am fully able to connect to other servers on vanilla. The MC version is a custom 1.6.4 mod pack by a friend. Does anyone know why I keep getting Failed to login: java.netConnectException: Connection refused?