I couldn't figure out what went wrong with our Cloudera cluster, there are multiple errors but most important one is that I can't access Cloudera Manager web UI at https://<cmserverip>:7183/cmf/home. It throws ERR_CONNECTION_CLOSED on Chrome.   If I run netstat -anp | grep 7183, it's 5000+ lines of CLOSED_WAITs with a bunch of ESTABLISHEDs all from the localhost IP      * Selinux is disabled. Iptables are empty.   * hostname -f returns correct name.   * /etc/hosts file are all same and correct on all nodes   * I also can't access any of the web UIs of the Hadoop services (such as Hue) on the cluster. They throw ERR_CONNECTION_TIMED_OUT on Chrome.   * All CDH services are up and accessible through command-line.   * None of logs I did find anything unusual.   * I CAN access non-CDH services on the nodes like RStudio or Jupyter.   I'm suspecting something failed with certification stuff or Kerberos but I don't know how to check those things. Would appreciate any help. ... View more