That log file is rather useless since it doesn't seem to show anything related to the content server. I'm not sure even a debug log would include the content server information.
Is there a reason that you are using an old version of calibre? 7.24.100 is the latest version.
Can you connect to the content server on the computer it is running on using either the IP address shown in the
content server listening at: line or 127.0.0.1:<port number>? Note that quite a few modern browsers will require you to use the http:// prefix since they assume all connections are https://
When you open a command prompt and enter ipconfig /all on the command line and then hit enter, does it show more than 1 active IP address?