We had a server this weekend that our Linux team reduced the number of cores per cpu (reduced the number of cores from 4 to 2 to make this a 2 socket system using 2 cores per socket for a total of 4 CPU Cores).
After they completed this process they then rebooted the server. When we tried to run a job to the agent we got the below message in the logs
CAUAJM_E_10229 Communication attempt with the CA WAAE Agent has failed! [:7520]
[10/07/2018 00:58:50] CAUAJM_E_40157 System Restart - Job [CYI03921] was unable to start.
[10/07/2018 00:58:51] CAUAJM_I_40245 EVENT: ALARM ALARM: STARTJOBFAIL JOB: CYI03921 MACHINE: petl250.amfam.com
[10/07/2018 00:58:51] <COMM_ERR_5 Communication attempt with Agent on machine [petl250.amfam.com] has failed.>
[10/07/2018 00:58:51] CAUAJM_I_40245 EVENT: STATE_CHANGE JOB: CYI03922
[10/07/2018 00:58:51] <Job <CYI03922> cannot start due to offline machine(s). Job placed in PEND_MACH status.>
There was an entropy issue. The valve was below 300. Increasing this value resolved the issue.