重装系统以后，用户名和密码在哪里看？
Sorry for answering in English because we’re not offering technical support with other languages.
If you had reinstall your OS, your default ID / password for VPS should be shown at dashboard of VPS. If it doesn’t work properly, please try to re-create your box.
this server’s Udp cannot be used
Weird… Really? Which UDP port did you try and test?