I was able to get splunk to start by removing my site-specific TLS settings. After starting splunk the first time, I restored my site-specific settings back to how they were before the upgrade, and restarted splunk. It seems to be fine now. These are the config changes I made: In /opt/splunk/etc/system/local/server.conf: Changed these lines: [sslConfig] cipherSuite = EECDH+AESGCM ecdhCurves = secp256r1, secp384r1, secp521r1 to [sslConfig] #cipherSuite = EECDH+AESGCM #ecdhCurves = secp256r1, secp384r1, secp521r1 Also, in /opt/splunk/etc/system/local/web.conf: [settings] cipherSuite = EECDH+AESGCM ecdhCurves = secp256r1, secp384r1, secp521r1 changed to: [settings] #cipherSuite = EECDH+AESGCM #ecdhCurves = secp256r1, secp384r1, secp521r1 Again, after starting splunk and completing the config migration, I restored the files and restarted splunk. ... View more