VMware vSphere Client 连接 vCenter 时"连接到 VMware vCenter Update Manager 时出错"解决办法

故障描述：
使用 VMware vSphere Client 连接 vCenter ，正常登录后出错，出现如下错误信息：
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连接到 VMware vCenter Update Manager 时出错 - [testserver:8084]。
由于服务器名称“testserver”无法解析，请求失败。 (无法解析此远程名称: 'testserver')
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错误信息如下图：

错误原因：
进过分析， 错误的原因是因为VMware vSphere Client所在主机无法正确解析vCenter服务器的主机名(这里为testserver)

解决办法：
分析出了错误原因，解决就很简单了： 手动添加vCenter解析到hosts文件中即可：
运行：
notepad C:\WINDOWS\system32\drivers\etc\hosts
在打开的hosts文件中添加主机解析即可：
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# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host
127.0.0.1       localhost
192.168.60.20       TESTSERVER
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