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有谁知道为什么在部署服务器（Windows 2008 R2 64bit，IIS7.5）SignalR（1.0.0.0 rc1）上会退回到端口 80 上的长轮询，但如果站点配置在不同的端口上则使用 SSE？

我不接触软件——只需将站点的绑定更改为端口 8081 并查看客户端日志。

端口 80：

    [19:28:15 GMT+0200 (FLE Standard Time)] SignalR: Negotiating with '/signalr/negotiate'. jquery.signalR-1.0.0-rc1.min.js:10
[19:28:15 GMT+0200 (FLE Standard Time)] SignalR: Attempting to connect to SSE endpoint 'http://192.168.10.91/signalr/connect?transport=serverSentEvents&connectionId=0e082fb2-d94d-4907-9579-b4ccde10816d&connectionData=%5B%7B%22name%22%3A%22onair%22%7D%5D&tid=8' jquery.signalR-1.0.0-rc1.min.js:10
[19:28:18 GMT+0200 (FLE Standard Time)] SignalR: EventSource timed out trying to connect jquery.signalR-1.0.0-rc1.min.js:10
[19:28:18 GMT+0200 (FLE Standard Time)] SignalR: EventSource readyState: 0 jquery.signalR-1.0.0-rc1.min.js:10
[19:28:18 GMT+0200 (FLE Standard Time)] SignalR: EventSource calling close() jquery.signalR-1.0.0-rc1.min.js:10
[19:28:18 GMT+0200 (FLE Standard Time)] SignalR: This browser supports SSE, skipping Forever Frame. jquery.signalR-1.0.0-rc1.min.js:10
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Object {Name: "WindowMain", Dock: 2, EleID: "mainContainer", Children: Array[5]}
 jquery.layoutengine.js:52
[19:28:18 GMT+0200 (FLE Standard Time)] SignalR: Attempting to connect to 'http://192.168.10.91/signalr/connect?transport=longPolling&connectionId=0e082fb2-d94d-4907-9579-b4ccde10816d&connectionData=%5B%7B%22name%22%3A%22onair%22%7D%5D&tid=8' using longPolling.

端口 8081

[19:28:04 GMT+0200 (FLE Standard Time)] SignalR: Negotiating with '/signalr/negotiate'. jquery.signalR-1.0.0-alpha2.min.js:10
[19:28:04 GMT+0200 (FLE Standard Time)] SignalR: Attempting to connect to SSE endpoint 'http://192.168.10.91:8081/signalr/connect?transport=serverSentEvents&connectionId=08b410ad-7be1-4a94-be02-c713df035c98&connectionData=%5B%7B%22name%22%3A%22onair%22%7D%5D&tid=9' jquery.signalR-1.0.0-alpha2.min.js:10
[19:28:04 GMT+0200 (FLE Standard Time)] SignalR: EventSource connected jquery.signalR-1.0.0-alpha2.min.js:10
[19:28:04 GMT+0200 (FLE Standard Time)] SignalR: Now monitoring keep alive with a warning timeout of 40000 and a connection lost timeout of 60000 jquery.signalR-1.0.0-alpha2.min.js:10
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