Hi, even I am facing the same trouble when trying to load Ambari web page, it shows 502 error.   It was working fine 2 days back but the error is showing from today when I tried to login in the morning. I have tried all the replies stated above, none worked. I will be grateful if someone can resolve this issue at the earliest.   Many Thanks ... View more

@divya_thaore  1. If you are starting service via Ambari / Cloudera Manager UI then check the operation logs which are displayed in UI while you start the service     Please check for any errors in the logs clicking the service operational logs. 2. If you do not see any operational logs or any operation triggerred while you start/restart service then kindly restart agent service once [ambari agent/cloudera-scm-agent] 3. Else please check logs from cli as suggested by @Shelton    If you still need help please revert. ... View more

@Divya Thaore If you are on HDP 2.6.x the login using credentials: root / hadoop and you get the prompt Did you run this command after ambari-admin-password-reset HTH ... View more

@Geoffrey Shelton Okot yes through sandbox from HW. ... View more

Also there are too many alerts automatically after starting,,.. So is it normally started or abnormally ? @Jay Kumar SenSharma ... View more