You are currently reviewing an older revision of this page.
All users are unable to login to Appian with the message:
'Error401 - Unauthorized: Sorry, your request could not be processed'
Tomcat logs the following in <APPIAN_HOME>/logs/tomcat-stdOut.log:
<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" is incorrectly configured in <APPIAN_HOME>/conf/custom.properties.
Ensure custom.properties is configured according to installation documentation so that the line conf.suite.SCHEME is uncommented and set to the correct value.
conf.suite.SCHEME
Restart Tomcat.
This article applies to Appian 18.3 and later.
Last Reviewed: September 2018