====== License key operation failure ======

You may experience the following error if you copy your existing license key to another server, which mismatches each other.

  [WARNING] Server signature does not match the license key #2.
  Please request a new license key!
  2018-03-28 19:59:36.226011 [NOTICE] Memory size is: 16270292KB.
  2018-03-28 19:59:36.621328 [ERROR] [LICENSE] License key operation failure: EXCEPTION LCA.2: fail to process

In another case, from LSWS admin, in the version manager, you may see Web Host Essential though you have a Web Host Professional license, which mismatches each other too. 

In this case, you should re-register a new license key for your server. Please run the following from command line.

  /usr/local/lsws/bin/lshttpd -r
  /usr/local/lsws/bin/lshttpd -V
  /usr/local/lsws/bin/lswsctrl restart