起初，我使用 FileZilla 连接服务器没有任何问题，但最近当我尝试连接任何服务器时，FileZilla 都会显示此错误消息：
Status: Connecting to 92.222.103.103:21...
Status: Connection established, waiting for welcome message...
Error: Connection timed out
Error: Could not connect to server
Status: Waiting to retry...
Status: Connecting to 92.222.103.103:21...
Status: Connection established, waiting for welcome message...
Error: Connection timed out
Error: Could not connect to server
Status: Connecting to 92.222.103.103:21...
Status: Connection established, waiting for welcome message...
Error: Connection timed out
Error: Could not connect to server
我认为一个程序正在使用相同的端口并且不允许 FileZilla 连接。