You may sometimes encounter the following problem while starting apache server
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[root@epsilon root]# /etc/init.d/httpd start
Starting httpd: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:443
no listening sockets available, shutting down
Unable to open logs
[FAILED]
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To fix this run the following commands
fuser -k -n tcp 443