Good find! Here's a copy of the workaround: Replace /var/lib/knox/data/services/yarn-ui/2.7.1/rewrite.xml with the attached rewrite.xml (change ownership to knox:knox) Restart Knox Note that "data" might be version-specific (e.g. data-2.4.2.0-258), or you can use /usr/hdp/current/knox-server/data/ instead. The fixed rewrite.xml is attached. ... View more