All users are unable to login to Appian with the message:
'Error401 - Unauthorized: Sorry, your request could not be processed'
Tomcat logs the following error in <APPIAN_HOME>/logs/tomcat-stdOut.log:
Error parsing HTTP request headerjava.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens
The conf.suite.SCHEME property is incorrectly configured in <APPIAN_HOME>/conf/custom.properties.
Ensure custom.properties is configured according to the Post-Install Configurations documentation, so that the line conf.suite.SCHEME is uncommented and set to the correct value.
This article applies to Appian 18.3 and later.
Last Reviewed: October 2018
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