安装 IPA Server 失败，带有错误信息：Server unreachable due to SSL error: [SSL: WRONG_VERSION_NUMBER]

Issue

• 在运行 ipa-server-install 时安装 IPA 服务器失败。返回以下出错信息：

  Configuring certificate server (pki-tomcatd). Estimated time: 3 minutes
  [1/29]: configuring certificate server instance
  Failed to configure CA instance: CalledProcessError(Command ['/usr/sbin/pkispawn', '-s', 'CA', '-f', '/tmp/tmpqrtqf61i'] returned non-zero exit status 1: 'Notice: Trust flag u is set automatically if the private key is present.\nERROR: Exception: Server unreachable due to SSL error: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:897)\n  File "/usr/lib/python3.6/site-packages/pki/server/pkispawn.py", line 562, in main\n    scriptlet.spawn(deployer)\n  File "/usr/lib/python3.6/site-packages/pki/server/deployment/scriptlets/configuration.py", line 836, in spawn\n    request_timeout=status_request_timeout,\n  File "/usr/lib/python3.6/site-packages/pki/server/deployment/pkihelper.py", line 911, in wait_for_startup\n    raise Exception(\'Server unreachable due to SSL error: %s\' % reason) from exc\n\n')
  See the installation logs and the following files/directories for more information:
  /var/log/pki/pki-tomcat
  [error] RuntimeError: CA configuration failed.
  CA configuration failed.
  The ipa-server-install command failed. See /var/log/ipaserver-install.log for more information
  

• 以下错误消息包括在 /var/log/ipaserver-install.log 中

  Installing CA into /var/lib/pki/pki-tomcat.
  
  Installation failed: Server unreachable due to SSL error: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:897)
  
  
  2020-10-28T19:59:47Z DEBUG stderr=Notice: Trust flag u is set automatically if the private key is present.
  ERROR: Exception: Server unreachable due to SSL error: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:897)
  File "/usr/lib/python3.6/site-packages/pki/server/pkispawn.py", line 562, in main
  scriptlet.spawn(deployer)
  File "/usr/lib/python3.6/site-packages/pki/server/deployment/scriptlets/configuration.py", line 836, in spawn
  request_timeout=status_request_timeout,
  File "/usr/lib/python3.6/site-packages/pki/server/deployment/pkihelper.py", line 911, in wait_for_startup
  raise Exception('Server unreachable due to SSL error: %s' % reason) from exc