https://community.cloudera.com/t5/Support-Questions/NiFi-UI-is-not-loading-template-after-login/m-p/226531#M188391 <P>@SP</P><P>-</P><P>A couple of things that can be done to troubleshoot this. </P><P>1. Did you inspect both the nifi-app.log and nifi-bootstrap.log for any ERROR or WARN messages during NiFi start?</P><P>2. After Staring NiFi and waiting at least 5 minutes, take a series of 3 thread dumps (3-5 minutes apart) that can be inspected for any threads that may not be progressing (same thread ID in same state in every thread dump). NiFi will validate the components as it loads the flow from the flow.xml.gz. If you are using any type of mounted NAS and that mount is in a bad state and your new flow is trying to access that mount it may cause the validation thread to hang waiting on response from that NAS.</P><P>3. Perform a diff between working flow.xml.gz and non working flow.xml.gz to see what kind of components are i use in new flow and how they have been configured.</P><P>-</P><P>Thank you,</P><P>Matt</P> Mon, 10 Dec 2018 21:33:53 GMT MattWho 2018-12-10T21:33:53Z