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This article addresses the issue where you are unable to retrieve the URL using PDF type.
All NPM versions
2016-04-27 13:50:11,275  WARN SolarWinds.Orion.Core.Actions.Utility.WebPageFetcher - We failed just on 0 attempt to export into pdf. We will try to export again.
2016-04-27 13:50:11,275  INFO SolarWinds.Orion.Core.Actions.Utility.WebPageFetcher - ExportToPdfCmd Exporting...
2016-04-27 13:50:41,478  ERROR SolarWinds.Orion.Core.Actions.Utility.WebPageFetcher - FAIL: Convertion failed. All workers are busy. Please
increase HtmlToPdf.MaxConcurrentTaskCount.EO.Pdf.HtmlToPdfException: Convertion failed. All workers are busy. Please increase HtmlToPdf.MaxConcurrentTaskCount. ---> System.Exception: All
workers are busy. Please increase HtmlToPdf.MaxConcurrentTaskCount.
Go to C:\Program Files (x86)\SolarWinds\Orion\SolarWinds.Orion.Core.BusinessLayer.dll.config, copy and paste the file to the desktop so that you have a backup of the original file and can roll back the change if necessary.
Take note of the default values:
<add key="NavigationTimeout" value="00:08:00" />
<add key="ConversionDelay" value="00:00:10" />
<add key="MaxConcurrentTaskCount" value="30" />
<add key="ConversionRetries" value="2" />
<add key="NavigationTimeout" value="00:60:00" />
<add key="ConversionDelay" value="00:01:00" />
<add key="MaxConcurrentTaskCount" value="50" />
<add key="ConversionRetries" value="5" />
Restart SolarWinds services after the change.