Hi, This thread is not really suited to the NiFi dev mailing list, I would suggest posting questions like this to the NiFi Users mailing list instead in future...
Your screenshot suggests there is something wrong with your load balance. A connection reset response suggests the load balancer is not listening on the port you're attempting to connect to. I suggest you start by taking a look at whatever you are using as a load balancer for your NiFi cluster. Check the configuration and the logs on the load balancer and investigate the issue from there. Kind regards, Jim On Mon, 8 Dec 2025 at 17:01, Sadhasivam, Johnson < [email protected]> wrote: > Hi Jim, > > Cluster configuration completed, in all the three servers attached > screenshot for your reference. > > Unfortunately Load balancer is not working, we have updated the load > balancer details in the nifi.properties file but the website still can't be > reachable (the irony is we didn't get any logs for load balancer issue in > nifi.app nor nifi. ), any clue? > > Keystore handshake and everything resolved. > > Server 1 Log > [image: image.png] > > Server 2 log > > > [image: image.png] > > Server 3 Log > > [image: image.png] > > LOADBALANCER PAGE: > [image: image.png] > > Below is our nifi.properties config, > [image: image.png] > [image: image.png] > > KR > JOhn > > > > > On Sun, Nov 30, 2025 at 3:00 PM Jim Halfpenny <[email protected]> > wrote: > >> Hi Johnson, >> The NiFi documentation is very good so I would always recommend starting >> there: >> >> [image: project-brand.jpg] >> >> Components <https://nifi.apache.org/components/> >> nifi.apache.org <https://nifi.apache.org/components/> >> <https://nifi.apache.org/components/> >> >> I am not familiar with running NiFi on windows, but I did note that the >> admin guide says you should run nifi.cmd and not run-wifi.bat to start the >> NiFi server. I see no reason not the use NiFi 2.6, there have been a >> significant number of improvements and bug fixes over previous releases. >> >> Kind regards, >> Jim >> >> On 28 Nov 2025, at 13:27, Sadhasivam, Johnson < >> [email protected]> wrote: >> >> Hi Jim, >> >> Thank you for the advice regarding the upgrade path. >> >> I apologize for the confusion; we have decided to change our approach. We >> are now planning a fresh installation of Apache NiFi 2.6 on new servers >> (dev2, stage2, and prod2), setting up a three-node cluster in each >> environment. >> >> Could you please provide the relevant documentation or the steps we >> should follow for a new NiFi 2.6 cluster installation? >> >> Since we are looking at a major jump, how stable would you rate the >> latest NiFi 2.6 release for production use right now? >> >> Kind regards, >> >> Johnson >> On Tue, Nov 25, 2025 at 2:30 PM Jim Halfpenny >> <[email protected]> wrote: >> >>> Hi Johnson, >>> Here's some general advice for upgrading your NiFi 1.17 installation. >>> There have been a lot of changes since NiFi 1.17 so you won't be able to >>> jump straight to the latest version. >>> >>> - NiFi 1.x is no longer maintained so ideally you want to aim to >>> upgrade to NiFi 2. >>> - Because you are on NiFi 1.17 you would need to upgrade to the >>> latest version of NiFi 1 (1.28.0) before you can upgrade to NiFi 2.x. >>> - The NiFi documentation is good, I would suggest starting there -> >>> https://nifi.apache.org/documentation/v1/. The admin guide has some >>> useful information on upgrading your NiFi cluster. >>> - Make sure you back up your NiFi installation before you begin >>> upgrading and test the upgrade in a non-production environment before >>> doing >>> this for real. >>> - There are a lot of features and processors deprecated in NiFi 2, >>> so you will need to make sure that you thoroughly test your workflows. >>> >>> Kind regards, >>> Jim >>> >>> On Mon, 24 Nov 2025 at 14:47, Sadhasivam, Johnson via dev < >>> [email protected]> wrote: >>> >>>> Hi Team, >>>> >>>> We are planning to upgrade our current Apache NiFi environment, which >>>> is running a three-node cluster on version 1.17.0 (attached screenshot for >>>> your reference). >>>> >>>> Could you please advise on the latest stable version of NiFi that you >>>> recommend for this upgrade? >>>> >>>> Additionally, please share any relevant documentation that includes the >>>> installation steps. >>>> >>>> >>>> [image: image.png] >>>> Thanks, >>>> Johnson Sadhasivam >>>> >>> >>
