This functionality was removed in Update 36 and SmartPlant Markup Plus Server 2019 SP 2.
Error
The following error displays when trying to publish a non-Hexagon file to PDF, TIF, or TIFF in the View and Markup page:
Error message posted says…."Error requesting document publish:Unable to load https://..... – " Status:0
Common Cause
You might encounter this problem if the token size generated by Integrated Windows Authentication (IWA) exceeds the header size of the URL request to publish to PDF, TIF, or TIFF. You must increase the maxHttpHeaderSize attribute in the server.xml file. Refer to the Apache Tomcat documentation at tomcat.apache.org.
Solution
Increase the header size limit allowed by the maxHttpHeaderSize attribute.
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Log on to the SmartPlant Markup Plus server as an administrator.
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Open the server.xml file delivered to the [installation location]\Apache Software Foundation\Tomcat [version]\conf\ folder.
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Increase the value specified by the maxHttpHeaderSize attribute.
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Save the file.