Connection lock issue in duplex TCP channel

[yallie]

Suppose we have a client application that connects to multiple servers.

It works like this:

1. Connect to server1 (success)
2. Start pinging server1 (like calling a remote method every second)
3. Connect to server2 (failure: server2 is offline)

While connection to server2 is in progress, the ping (3) seems to be blocked.
The ping is not sent to server1 until the connection to server2 times out.
Repro: https://gist.github.com/yallie/eac36078d201299174eb82c2721a7d43