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When attempting to start data server after upgrade to version 18.1 and above or new installation for versions 18.1 and above, data server fails to start with below error in watchdog.log
{"level":"ERROR","time":"2019-08-17T16:09:28.743Z","logger":"watchdog","caller":"Watchdog.java:652","thread":"ForkJoinPool.commonPool-worker-2","msg":"Failed to start RTS-0 engine (port=5405)"}com.appian.data.server.UnrecoverableError: Could not establish WebSocket connection with 1.1.1.2:5405. The target q process exited abnormally. Check for earlier errors (e.g. license or startup errors).
The rts-engine.log has the below error:
'2019.08.20T23:57:59.999 host
The 'host' at the end of rts-engine.log means unlicensed host
k4.lic requires the output of hostname command for requesting license. Compare the output for hostname command and the hostname for which license was requested. In case they don't match, request a new copy of license and deploy.
Versions 18.1 and above