XAMMPP 启动Error: Apache shutdown unexpectedly

错误提示

17:27:17  [Apache] 	Error: Apache shutdown unexpectedly.
17:27:17  [Apache] 	This may be due to a blocked port, missing dependencies, 
17:27:17  [Apache] 	improper privileges, a crash, or a shutdown by another method.
17:27:17  [Apache] 	Press the Logs button to view error logs and check
17:27:17  [Apache] 	the Windows Event Viewer for more clues
17:27:17  [Apache] 	If you need more help, copy and post this
17:27:17  [Apache] 	entire log window on the forums

解决方案

这个报错通常由于两个端口被占用导致，只要修改成其他端口或关闭占用端口的进程即可

• 443端口
  443端口是https服务使用，可在配置文件httpd-ssl.conf中修改，比如可修改为

  #
  # When we also provide SSL we have to listen to the 
  # standard HTTP port (see above) and to the HTTPS port
  #
  Listen 4430
  

• 80端口
  80端口是http服务使用，可在配置文件httpd.conf中修改

  #
  # Listen: Allows you to bind Apache to specific IP addresses and/or
  # ports, instead of the default. See also the 
  # directive.
  #
  # Change this to Listen on specific IP addresses as shown below to 
  # prevent Apache from glomming onto all bound IP addresses.
  #
  #Listen 12.34.56.78:80
  Listen 8080
  

知识扩展

端口分类

按端口号可分为3大类：
（1）公认端口（Well Known Ports）：从0到1023，它们紧密绑定（binding）于一些服务。通常这些端口的通讯明确表明了某种服务的协议。例如：80端口实际上总是HTTP通讯。
（2）注册端口（Registered Ports）：从1024到49151。它们松散地绑定于一些服务。也就是说有许多服务绑定于这些端口，这些端口同样用于许多其它目的。例如：许多系统处理动态端口从1024左右开始。
（3）动态和/或私有端口（Dynamic and/or Private Ports）：从49152到65535。理论上，不应为服务分配这些端口。实际上，机器通常从1024起分配动态端口。但也有例外：SUN的RPC端口从32768开始。