The error 403, it is shown in the HDFS, YARN and MapReduce in the "Quick Links"
*HDFS==>Quick Links NAMENODE UI, Show Authentication,
*YARN==>Quick Links, ALL= HTTP ERROR 403
*MapReduce2==>Quick Links, ALL= HTTP ERROR 403
HTTP ERROR 403 Problem accessing /index.html. Reason: org.apache.hadoop.security.authentication.client.AuthenticationException
Some basic check you can do is: Check if your web server is up and running on your Nodes.
If you are using Linux machine use the below-mentioned command to check status:
service httpd status
If it is in stop status please start it using the below command:
service httpd start
One question here:
What is the type of authentication method are you using?
Have you enabled Kerberos in your Cluster? Do you also have the SPNEGO enabled recently to your cluster?
If SPNEGO is enabled then browser needs to be SPNEGO Enabled. As described in the following doc: https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.0/bk_security/content/enabling_browser_access...
For Firefox Browsers please add the cluster domain name in the following properties and then do a "kinit" from the machine where the browser is running.