是，Flex 客户端可以连接到各种服务器，包括 BlazeDS.阻止客户端连接到 BlazeDS 服务器的是 crossdomain.xml，这是托管在服务器上的连接策略文档.

Yes, a Flex client can connection to a variety of servers, including BlazeDS. What could prevent a client from conenctiong to a BlazeDS server is the crossdomain.xml, which is a connection policy document hosted on the server.

我对您的问题有一个顾虑，那就是使用术语'Flex server'.大约在 2005 年，人们在 Flex 1 中谈到了这一点！Adobe 现在在 Flex 4 上，一些相关的服务器技术/平台/软件/协议是 BlazeDS，Red5、FMS LiveCycle 数据服务、JSON、AMF3 等

I've got one concern about your question, and that is using the term 'Flex server'. That was something folks talked about with Flex 1, circa 2005! Adobe is now on Flex 4, and some relevant server technologies/platforms/software/protocols of interest are BlazeDS, Red5, FMS LiveCycle Data Services, JSON, AMF3, etc.