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MongoDB ServerSelectionTimeoutError：尚未找到服务器

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MongoDB ServerSelectionTimeoutError：尚未找到服务器

我在标准 AWS Ubuntu 14.04 服务器上运行了一个 mongodb 实例。经过一番麻烦（使用 升级服务器sudo mongod --upgrade --dbpath /var/lib/mongodb/）后，我现在可以运行该服务器，但是当我尝试从我的 Python 代码连接到它时，我得到了一个ServerSelectionTimeoutError: No servers found yet。

我重新启动了 mongodbsudo service mongodb restart并检查了日志：

Wed Dec 23 15:15:14.571 [initandlisten] MongoDB starting : pid=21554 port=27017 dbpath=/var/lib/mongodb 64-bit host=ip-172-31-29-10
Wed Dec 23 15:15:14.571 [initandlisten] db version v2.4.9
Wed Dec 23 15:15:14.571 [initandlisten] git version: nogitversion
Wed Dec 23 15:15:14.571 [initandlisten] build info: Linux orlo 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 BOOST_LIB_VERSION=1_54
Wed Dec 23 15:15:14.571 [initandlisten] allocator: tcmalloc
Wed Dec 23 15:15:14.571 [initandlisten] options: { bind_ip: "127.0.0.1", config: "/etc/mongodb.conf", dbpath: "/var/lib/mongodb", journal: "true", logappend: "true", logpath: "/var/log/mongodb/mongodb.log" }
Wed Dec 23 15:15:14.575 [initandlisten] journal dir=/var/lib/mongodb/journal
Wed Dec 23 15:15:14.575 [initandlisten] recover : no journal files present, no recovery needed
Wed Dec 23 15:15:14.593 [initandlisten] waiting for connections on port 27017
Wed Dec 23 15:15:14.593 [websvr] admin web console waiting for connections on port 28017
Wed Dec 23 15:15:15.337 [initandlisten] connection accepted from 127.0.0.1:45356 #1 (1 connection now open)
Wed Dec 23 15:15:15.850 [conn1] end connection 127.0.0.1:45356 (0 connections now open)
Wed Dec 23 15:15:16.191 [initandlisten] connection accepted from 127.0.0.1:45360 #2 (1 connection now open)
Wed Dec 23 15:15:16.788 [conn2] end connection 127.0.0.1:45360 (0 connections now open)
Wed Dec 23 15:15:17.130 [initandlisten] connection accepted from 127.0.0.1:45364 #3 (1 connection now open)
Wed Dec 23 15:15:18.108 [conn3] end connection 127.0.0.1:45364 (0 connections now open)
Wed Dec 23 15:15:18.439 [initandlisten] connection accepted from 127.0.0.1:45368 #4 (1 connection now open)
Wed Dec 23 15:15:18.934 [conn4] end connection 127.0.0.1:45368 (0 connections now open)
etc. 
etc.

我似乎找不到有关立即关闭连接的任何信息。

有人知道我该如何解决这个问题吗？我正绞尽脑汁，所以欢迎大家提供建议！

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