If you messed up your DNAC or just want to start over, you can do so by downloading the ISO for the appliance. Get the ISO on the below link: Download DNA Center ISO from CCO After downloading the ISO, you� must� create a USB installer by using� Etcher If you use Rufus or any other tools for the USB installer creation, it might not work due to insanely long file names in the ISO.
NOTE! Using ISE 2.3p3 is not an option due to CSCvi94778 If you’re deploying a DNAC and you want to integrate with ISE, you might have read the following documents: Perform Post-Installation Tasks Cisco ISE Integration Limitations I did and ended up with this error in DNAC when adding ISE: Clearly this is a certificate error. The thing is that Cisco mentions that SAN (Subject Alternate Name) is essential for the trust between DNAC and ISE.