Web Server error - permission denied 403

Hi all,

We have upgraded Appian in the integration environment from 18.4 to 20.2 and it was fine. We are now upgrading the dev environment and we have a problem when loading urls through the web server. Whenever a url is requested we get a 403 error and the following message is added to the tomcat app server log:

2020-11-09 19:01:43 WARNING [ajp-nio-0.0.0.0-8009-exec-1] org.apache.coyote.ajp.AjpProcessor.prepareRequest Rejecting request due to unknown request attribute [LOCAL_ADDR] received from reverse proxy

accessing the urls bypassing the web server works fine. Does anybody how to solve the problem?

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