Unable to read the 'URL' HTTP variable

Document ID : KB000111499
Last Modified Date : 20/08/2018
Show Technical Document Details
Running Web Agent, this one returns the following error:

  1. [2804/5900][Fri Aug 03 2018
     LLA: Logging initialized.


  2. [2804/5900][Fri Aug 03 2018
     ADMIN: Administration Manager initialized.
  3. [2804/5900][Fri Aug 03 2018
     HLA: Initialization complete.
  4. [2804/5900][Fri Aug 03 2018
     11:22:08][CSmHttpPlugin.cpp:580][ERROR][sm-HTTPAgent-00040] Unable
     to resolve URL. Exiting with HTTP 500 server error '10-0002'.
  5. [2804/5900][Fri Aug 03 2018
     HLA: Missing resource data.

How can we fix this issue?
  Web Agent R12.52 SP1 CR07 64bit on IIS 8.5 64bit on Windows 2012
  The health checks from your load balancer monitoring tool is sending the request without the HOST header
Configuring the load balancer properly to set the request with HOST header will solve this issue.