I'm having the same issue after upgrading to 2.3 on Ubuntu 18. Everything loads, bbb-conf --status all active, no errors on bbb but I keep getting the "404 Not found" error when trying to access the Redlight Rooms or any resource requiring the html5 client application.
After running sudo bbb-conf --debug I get some errors as shown below:
May 25 21:37:11 cloudroom sh[28344]: SignalException: SIGTERM May 25 21:37:14 cloudroom sh[28344]: Original Exception (Redis::CannotConnectError): Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED) May 25 21:37:14 cloudroom sh[28344]: /usr/lib/ruby/vendor_ruby/rake/application.rb:186:in standard_exception_handling' May 25 21:45:37 cloudroom sh[29476]: SignalException: SIGTERM May 25 21:45:41 cloudroom sh[29476]: Original Exception (Redis::CannotConnectError): Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED) May 25 21:45:41 cloudroom sh[29476]: /usr/lib/ruby/vendor_ruby/rake/application.rb:186:in standard_exception_handling' May 25 22:03:58 cloudroom sh[4189]: SignalException: SIGTERM May 25 22:04:02 cloudroom sh[4189]: Original Exception (Redis::CannotConnectError): Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED) May 25 22:04:02 cloudroom sh[4189]: /usr/lib/ruby/vendor_ruby/rake/application.rb:186:in standard_exception_handling' May 25 22:30:07 cloudroom sh[6716]: SignalException: SIGTERM May 25 22:30:08 cloudroom run-prod.sh[6823]: 2021-05-25T22:30:08.231Z WARN i.l.c.protocol.ConnectionWatchdog - Cannot reconnect: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:6379 May 25 22:30:08 cloudroom run-prod.sh[6823]: 2021-05-25T22:30:08.235Z WARN i.l.c.protocol.ConnectionWatchdog - Cannot reconnect: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:6379 May 25 22:30:08 cloudroom run-prod.sh[6823]: 2021-05-25T22:30:08.256Z WARN i.l.c.protocol.ConnectionWatchdog - Cannot reconnect: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:6379 May 25 22:30:08 cloudroom run-prod.sh[6823]: 2021-05-25T22:30:08.257Z WARN i.l.c.protocol.ConnectionWatchdog - Cannot reconnect: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /127.0.0.1:6379 May 25 22:30:11 cloudroom sh[6716]: Original Exception (Redis::CannotConnectError): Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED) May 25 22:30:11 cloudroom sh[6716]: /usr/lib/ruby/vendor_ruby/rake/application.rb:186:in standard_exception_handling'
Any assistance will be greatly appreciated, I've been trying to solce this for the past two days.